Commodore 64/64C
Contents
1. CEE SI Ad gyjA ETA V 285 z s Q ar x or e 5 f 00 E aiu px cpm 39 5 pp eem 181 444849 E CARTRIDGE EXPANSION P N FEMALE CNS 37 SCHEMATIC 252278 sheet 2 of 2 0 250880 7 278 I 2444 Maras u d 3 49 S m aw SE N 244 lt X ES 557 g X Fr lt as RSS Z gt lt lt 34 N U 3 5 x o d c A U 9 8 NK x X A 55 Isg gt 5 d SSA d d of SdA a vo 955 lt lt SS A i gt v M X W gt 25 lt lt ly L o celos 52 RECZ z c 34H ERC Gi 82 7 Q df B 27 tipje 3907 TTM 9 in A gt RS iE a 55635 pa an 00 Se sin M b lt 3 gt pU 222 gt QA QU 91 99 IDAG a onal o on L a lt t zx iy e S ox 00 gt U 4 WAS x 32281 gt 55 AN ct 470PF LED CONNECTOR EA AN awa RPS 3 Jk BERE m S 990 OHM erc 0 Rees ee A 33 25224 Cite 494944 lt i 5 gt VU Xo ina AED VY SZ m gt 011 gt gt 1825 822. T Q5 N ee 3 3K 45 c The Cassette Interface Circuits U7 is a 6510 microprocessor One of the features of the 6510 is a built in parallel I O port PO P5 P3 P5 control most of the cassette interface circuitry P3 pin 26 of U7 outputs the write data signal to connector on pins E and 5 P4 is an input that senses the play switch depressed on the cassette deck P5 is an output that controls the cassette motor When goes low Q2 cuts off CR2 regulates Vb of O1 at 7 5 volts this forward biases Q1 and Q3 passing current through the cassette motor coil U1 is a Complex Interface Adapter CIA Parallel ports serial outputs and Timers are standard features of the CIA Read data enters on pins D 4 of CN3 U1 accepts the read data signal on the FLAG input pin 24 11 552 BNI bad d IOYXLNOD D N 8 39 2 oma rn 22 esh x TT 13 OLO aeo 0 PECO F COR gt e II oxlalcow 1 1 15 7 e 10 15 ppp i ec 58 r gt PO 58905 _____ m 8 7 9 5 4 3 2 5 833 5 aik 1 L 75068 3 3K cza C38 E 5
3. O4 Obtyv 2 NAL ISN LON t 98 Wall 647 602 92 ISN 2 7 6999 0 91 4 8020 E JOLY 2448 FIEVLINS SI 1 2 8959 WO 9 A3 YSY 257 LON OG Ax 4959 LAB 6999 2T9VLUDS SM LI LOLA s 240158007 NYI 429342 0357 EW NODSVXI ANN ONY O XEW MINIS 20 FOVLIOA 01 NNISYZH Xid 01 9 IH i 7 647Q 13 1 0 5 n 4h O O 4 1 N2d0 RAZ 4D 60 Tied 020 ISIN 2015 100152 N3dWnt 2 127735 AUAN 1 jiviad 5022 ecu IGIS 7004 2 A co fE f pp 9 1404 211396717 23 p PARTS LIST PCB ASSEMBLY 7250407 04 C Indicates Commodore Stocked Part Number INTEGRATED CIRCUITS 6526 CIA 2364 Basic ROM 2364 Kernal ROM 2332 Char ROM 2114L 20 RAM 6510 y Processor 7406 7416 4164 200 nS 7415257 74LS258 7415139 4066 825100 6581 SID 6567 VIC II LM556 4164 200 5 74LS257 74LS373 741508 4066 741574 7415193 7415629 4044 25 1815 TIP29 A 25 1815 2 7V Zener IN4371 7 5V Zener IN755 Bridge S2VB10 DBA20B DBA20C Rectifier 1 4001 C 906108 01 C 901226 01 C 901227 03 C 901225 01 901453 01 C 906107 01 901522 06 sub 901522 14 901505 01 901521 57 901521 58 901521 18 901502 01 C 906114 01 C 906112 01 C 906109 04 901523 03 901505 01 901521 57 901521 29 901521
4. lt ce A2 AIO 4 C27 C42 C26 c25 C40 8 le Tle 7je 022 4164 2 RAM 024 UI U23 UIO 98 021 41642 41642 4164 2 4164 2 41G42 4164 2 RAM RAM RAM RAM RAM g w U gt U 7 2 PZ 2 2 B lt wt O AWWas Nid S das 22298 FNO N 9 EL LEES kl 25021111 21 22 11 BOREM E lo HA 7 I 8 IK mm C13 yea ng 23G4A LL i l 38 10 a 5 IK 25 KERNAL 1 ELECTRO ROM ij 2 LYTIC 22 A a EFEE 4 T to s 499 ELECTROLYTIC CTORAM gt 5 EI 8 2 lt S I 2 CHITRA B AIG El X VIC SID SHOULD HAVE gt BS SEPARATE GND RETURNS EZ 1 02 MHz NTSC TT 0 98 MHz PAL 2 FM FR p ER 14 258 NTSC gt 17 734472 PAL CRESET gt 8 18 MHa NTSC 7 88 MHz PAL ADOT SERS Dots CARTRIDGE EXPANSION 44 PIN FEMALE CNG 22 2 24 v0 ZOvVOSC LNOAV1
5. gt lt 3 59 23 A e 3 HIP 5 To SES mx TIT ni 1 11 SES R 470K v J Cien 4 Q GUNS MOG SII SE 67 000 9 oO N WCRSFORWKTHKLIQN lt gt PNI 8ND 6 2 I NI Nid 9 680 680 IWW 37V 02 2903 31VH 22 578 35 21204 VOYLNOD 14504 Qe1UO 8 A 3 Leod 5351 27 99 3HOQOWMWOO LLNI 3400009 829082 ON ASSY 1 ii Up u Bin P WO 1 1 193739 3 2 GNDOS 2 WWLAT Noluseg 3952 gt Loa 3yv5 Noa LYOHS wsdo zwvo LNoa sewn 254 v 0 329 20 WM 0 429 20 121779 N 10 46952 NG 10 SZO SZ ________ _______ 2 9 4 4 4 mam 6 1 i RN i PE QA 000 IM 15 J vu AE 14 tl pw EZ x 5 2 8 ve eli ee 479 20 LYOHS LYOHS 0 N3JO 29 0 70 0 WHIT 325 77 440
6. COG 1 47 1 I ap 25V 7 50V awe 207 D B f C64 CIRCUIT THEORY 5V 5V I 5V o R34 R36 47K 174 C24 IO 25V I RSO IM 5 C105 Reset Logic Circuits U20 is a 556 IC timer configured as a one shot multivibrator The output pulse width is determined by the size of R34 and C24 Pulse width 1 1 x R34 x C24 5 seconds The output on pin 9 is active The output of U8 is low active Reset initializes all the processor logic and causes the processor to load the program counter register with the address of the first instruction of the operating system program called the KERNAL The starting address is stored in locations FFFC and FFFD The first instruction is decoded and executed giving KERNAL control of the computer opera tions The reset pulse occurs when turning the power on to the computer Vc 0012 TO C64 CIRCUIT THEORY I 4 R26 i 9 1 1 T _ 4 GE Nc 5 LSK o 2 BLA U3I 0 827 RNG 7415629 N 2K 1 4 Vc I I 33pf i SOV 20 050 vc 4 31818 741 5193 2 ie 8 2 puase CHARGE DETECT PUMP 96 P 5 gt usr 74LSG29N R22 u 5 lt 1 8 1818 MHz C36 The C64 Clock Circuits
7. Crystal Y 1 develops a 14 31818MHz fundamental frequency clock signal U31 is a Dual Voltage Con trolled Oscillator The output on pin 10 is a 14 31818 MHz clock signal called the color clock R27 can be adjusted to obtain exact output frequency is a frequency divider that outputs a 2MHz signal on pin 6 U29 is a D flip flop which outputs a 1MHz signal on pin 9 U32 is a Phase Frequency Detector which compares the output of the U29 to the phase O clock and outputs a dc voltage on pin 8 that is proportional to the phase difference between the inputs The second half of the Dual Voltage Controlled Oscillator U31 generates an 8 1818MHz clock signal called the DOT Clock The VIC IC divides the DOT clock by eight and outputs this as the phase O clock on pin 17 The output of the Phase Frequency Detector is applied to the frequency control input pin 2 of U31 This causes tracking of the dot clock and the color clock because one input pin 3 of U32 is the phase O clock which is derived from the dot clock and the other input pin 1 of U32 is derived from the color clock The C64B Clock Circuits Refer to schematic 251469 Crystal Y1 develops the fundamental 16MHz clock signal U31 is a Clock Generator IC that outputs the 8 1818MHz DOT clock on pin 6 and the 14 31818 MHz color clock on pin 8 C C64 CIRCUIT THEORY 00 91 U ZUSIGZ N 205004 0 WN 0 CA
8. AEC VCC AO A15 GND PO P5 DBO DB7 R W 02 RES Phase 1 clock input This clock input is used to develop the internal overlapping phase 2 clock 1 MegHz or 2 MegHz speeds Single step operation input low applied will cause the processor to halt The cur rent address line being fetched will be on the address bus Can also be used to in terface slower devices to the micropro cessor Interrupt request input When a low pulse is applied a jump to a location specified by the contents of FFFE and FFFF will oc cur to service the interrupt if the interrupt mask flag is not set This is a maskable interrupt Non maskable interrupt input A low tran sition will cause a jump to a location specified by FFFA and FFFB to a subrou tine which will service the interrupt Address enable control input A low ap plied to will cause the address bus to enter hi impedance state so other devices can control the address bus 5VDC input Address bus outputs Unidirectional bus used to address memory and I O devices The address bus can be disabled by con trolling the AEC input Dc ground connection I O bidirectional port This port can be controlled via memory locations and 0001 0001 Output register Data direction register Bidirectional data bus This is the bus that passes the data to or from any I O device or memory Read Write output The processor gener ates a low level when writing and a
9. T 3 i x W 2594V 0 5 SHORT Pay 2 gt 223 PCB ASSY 250469 252311 REV 3 6 Q _ woo 50 2124 2 20 10 Pn a I p i 9u2 sn KO 599 n 2 sl wa E BOARD LAYOUT PCB ASSEMBLY 250469 3 CASSETTE PIN MALE EDGE SERIAL BW FEMALE DIN BOARD RAPIN MALE CONTEOL PORT 2 MALE 287 CONTROL PALE 237 2 PORT y A PIN MALE ESG P w E SCHEMATIC 252312 RI 470 t T ont Wh zasl A s 55 22 Q2 390 id 0 CAD SENS M n 25 8 2 gt i gt RY Set co c2 Ly Fv 1 ox N RIP 708 ii n 5 Ving 2 LED CONNECTOR CSE 3 34228530 70 1037 CASS wer P3 ES C56 5 SA c55 gt VOD qs SPA NT Vas 4 5 pre ah 9 m ae 21 34 3 po RAS 5 j I UI 4084 4 RAE EO 2 YoY Y C70 71 22000p FOR 9592 g72 FOR 6581 180 81 220027 FOR 98589 900pK FOR 6381 lt 8 gt 45337 4 b 1 lt R
10. b 9 2 4 A r 0 7 q 5 2 3 4 8 Nid OZ IND CiMVvOSA35 AWW v2 UC 29 ZZA INP mO 3 5 2150 mQgr xurmmooxo ee ou 39 T u AU 6 e nw 07 5G SCHEMATIC 326106 SHEET 1 OF 2 CB ear T ee um BA C3 Q 2 228 028 22534 OZ L 4066 5 m zo CAN 5 o 5 Vvp 422 CG4 CG3 E E ES o Y ES 2 47 IL L 4 04 m 25v 50V 7 50V 82 20 20 FBI8 L2 5C hH 2125 Tos 215 5 n vc C82 65 CGG 7 porer a eee 17 I IA HC E SOV TOYS ip r E 20 7 o JOYBS IO a 35 90 TRNG POTAY POTAY 1 JOYAL BTNA LP J L 4 31818 MHz iz zi pcz 07 amp COLO De i D5 PHASE CHAR Eco FA 04 an eo D3 D2 ___ Ul T 6526 032 MC4O44 ele k Ho ret 5 NE H Ncc 853 ROWO 252 AC ROW J PBI DCFF RSI Boe fg T 4 PB2 RSO DT R23 4
11. 1 5A MISCELLANEOUS Continued 30 MODULATOR SCHEMATIC 7251696 COLOR N O o COLOR 007 LUMIIN O o LUM 007 Df 3 LC 48 2 220 150 O COMP 007 RH 072 50 150 2 50 6 8K 270 875 580 75 K C16 256 C18 22 RI3 Riad C8 20p 7 00 K 1K 420002 RF 007 CIS 7 139 ILE 221 lt 923 P 120 1 20 270 270 GKOUND AUDIO N O 05 sS cz 14 22000 P 26 NOTE 5 D1 D2 MAISIK OR EQUIVALENT D3 MASS 7 OR EQUIVALENT D4 DS 55 06 OR EQUIVALENT 26 HZ OR EQUIVALENT Q Q2 25C240 5 OR EQUIVALENT QI Qd 2 5C 2776 OR EQUIVALENT QS 25 2 20 OR EQUIVALENT COMPONENT PARTS VALUE R Q L H amp G rS SEE 4 SCHEMATIC 7251469 SHEET 1 2 EG MIE o I 3 Du sms 4 23 4 64 2 RAM RAM U24 SNI WA 32727 NiA9 OBAI OINK 3 2 CAN LI z py x X X X Y N R N X im X PSD 742 A 4 D M pa d ha M I 4 x JG m U XJ U i ur E 02 7701 P 7700 NTSC NACTIVE DOT CLOCK PCOLOR Y 37 777 UIT lt PAL 7 88 3818 90 31 CARTRIDGZ EXPANSION 9 P N FEMALE CNS 34 ASSIGNMENT 1 2 3 4 5 6 7 8
12. Electrolytic Ceramic Film Ceramic Ceramic Ceramic Ceramic Electrolytic Ceramic Electrolytic Electrolytic Ceramic Ceramic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic Ceramic Ceramic Electrolytic Ceramic 1 uF 25V 10 pF 25V 10 1 pF 25V 16 pF 596 1 pF 25V 82 pF 596 1 pF 25V 47 uF 1000 pF 25V 1 25V 470 pF 50V 100 uF 16V 10 25V 1800 pF 50V 10 25V 1096 1 25V 22 uF 25V 50V 2096 22 uF 25V 1 pF 50V 20 10 uF 25V 1096 A uF 25V 1 25V 10 pF 25V 1 25V 5096 50 10 50 8096 8096 5096 Header Assy 20 Pin 903331 20 6 Pin Din C 903361 01 8 Pin Din C 325573 01 44 Pin Card Edge C 906100 02 7 Pin Din C 251116 01 Plug Assy 9 Pin MINID C 906126 01 Header Assy 3 Pin 903332 03 901151 17 325570 01 C 325559 02 Coil Inductor 2 2 H Coil Inductor 1 2 Choke Coil Crystal 14 31818 MHz C 900558 01 Rocker Switch DPDT 904500 01 Voltage Regulator MC7812CT Voltage Regulator MC7805CT 901527 01 901527 02 Modulator C 251080 01 Fuse Normal 250V 1 5 Ferrite Bead 903025 01 Connector Panel Power ON OFF Cartridge Guide 251095 01 326116 01 Shield Box Shield Cap C 251023 01 C 251024 01 25 MODULATOR SCHEMATIC 7251025 COLOR INO OCOLOR OUT LUMI INC LP A
13. 03 901502 01 901521 06 901521 26 901521 68 906128 01 C 902693 01 sub 902653 01 C 902693 01 906103 02 900941 01 C 251026 01 C 251026 02 C 251026 03 900750 01 RESISTORS Continued Jumper Wire Pot 5000 1K RESISTOR PACKS RP1 2 339 8 Pin Bourns No 4308R 102 330 3 3 8 Pin Bourns No 4308R 101 332 RP4 3 3KQ 10 Pin CAPACITORS Ceramic 1 pF 25V Electrolytic 10 aF 25V 50 1 aF 25V Ceramic 470 pF 10 Ceramic 1 pF 25V Electrolytic 10 pF 25V 50 Ceramic 1 pF 25V Electrolytic 10 pF 25V 50 Ceramic 1 pF 25V Electrolytic 2200 pF 16V Film 22 uF 100V 2096 Ceramic 1 25V Ceramic 360 pF 50V 10 Electrolytic 10 pF 25V 5096 Ceramic 1 pF 25V Electrolytic 10 pF 25V 50 Ceramic 1 pF 50 Ceramic 20 pF 50V 5 SL Ceramic 1000 pF 50V 1096 B Ceramic 51 pF 5OV 596 SL Ceramic 1 uF 25 Ceramic 1800 pF 50V 1096 B Ceramic 1 pF 25V Ceramic 1 pF 50 Ceramic 1 pF 25V Electrolytic 10 aF 25V 50 1 uF 50 1096 1096 1096 1096 1096 1096 24 PARTS LIST PCB ASSEMBLY 250407 04 Continued C Indicates Commodore Stocked Part Number CONNECTORS CAPACITORS Continued C59 60 C62 65 C66 67 68 C70 C74 82 C83 C84 C85 C88 C89 C90 C91 C92 C93 C94 C95 96 C97 C98 99 C100 C101 C102 C103 C104 C105 C108 C200 Ceramic
14. 5 NC 4217 22722277 IU NC 42512 yx NO ocoo DcCrr 25 x cy k 50504 D000 DIFF THE ASSSAS 8 S O 2222 5 5 m AUDIO VIDEO BPH FEMALE BIN CMS TS Y CE e 1 k EI J u T 03 27 8 5 o E 1723 gt 2 gt 12 le p CE ae 3 oh sl Is ET 1215 2 T 4 E 25144 Ud 22149 M gt di N 7 8 27 298 464 l 25932 C 3 A 5 BASIE CHARACTER 36 E000 FFFF 4 tbooo 1i DEFF T FT A000 BFFF FF P INS 17 70 40 62 ue 28 1127 ye 22 xp 2 20 UJ 12 lt tor eN pL 5 23 7 x 45 DOT CLOCK Ameer T rwa z x u ze B RE RESISTOR SHOULD BE REMOVE FOR 8580 S D L S sh Tere one OHI FRANCE VERSION E aa ITNA CIAL R2 208 RESISTOR Z C43 220047 CAPACITOR FEOUIRED 2 3 POWER SUPPLY 658 S D VERSION CR7 2 6V SHOULD BE USED 8580 S D VERSION R7 SHOULD GE USED JUMPER CONECTION 73 NTSC J3 SHORT PAL 4 CLOCK 8 8 FOR NTSC 7 8 FOR PAL RPS 20 cc id 3 Y 94 3 2 8 FOR HTSC
15. 50 17 18 44 ai 16 741 5629 r c C39 17 L R34 41 R36 IT 40 RW gt Ree T e 4TK 1K JJ 4 rem four TUG AI ann pot aoc 4 C36 RSD IM RP4 8 1818 MHz T Zop r 3 3K 50 t cao NOTES LDATA 4 7 LL CK IN4OOI SOV VC SHOULD BE USED TO DRIVE ONLY DEVICES DATA QUT 7 m gt 5 INDICATE D ATN OUT 5 LE 5 5 2 Y1 14 3L 616 MHZ NTSC EE 10010 45 7 17 734472 MHZ PAL as EN 38 9 3 ALL RESISTORS ARE 1 4 UNLESS O g UNREG Es OTHERWISE SPECIFIED 4 _NR2 4 p SUM 4 ALL CAPACITOR VALUES AREIN uf o AN Toa 21 1805 4 W UNLESS OTHERWISE SPECIFIED Ms A I I2200 5 50 PF ONLY WITH R4 OR R4T2 VERSIONS __ 16 t OF 6567 5 6 NO 2896 FOR INSTRUCTIONS ON USE E Sw 2 T 220PF ONLY WITH RI VERSION OF 6569 O 5 22 us E SHIELD GND j L4 L5 12 I RA 20 11 2 AH C97 25 SSPE 22 7 1 amp 25 E MC LED CONNECTOR ome m x NC Mon ne TU B CARTRIDGE EXPANSION 741 5 8 2 427 m CNG 2 7V 7 PIN MALE DIN 21 PIN CONFIGURATION COMMODORE APPROVED VENDOR ACCESS POWER PART SOURCE 1 PART TIME CYCLES ACTIVE STANDBY NUMBER OF SUPPLY NUMB
16. 50V 25V 10 25V 4 7 16V Electrolytic 2200 F 16V Film Ceramic Ceramic 1 25V 360 pF 50V 390 pF 22 F 25V 1 25V 1000 pF 50V 51 pF 50V 1 pF 25V 1800 pF 50V Ceramic 1 pF 25V Ceramic 1 uF 25V Electrolytic 1000 F 25V Electrolytic 470 pF 50V Electrolytic 100 pF 16V Ceramic 1800 pF 50V Ceramic 1 pF 50V Ceramic 1 pF 25V Ceramic 470 pF 50V Ceramic 68 pF 50V Ceramic 470 pF 50V Ceramic 1 pF 25V Ceramic 150 pF 50 Ceramic 220 pF 50V Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Trimmer 1096 50 10 2096 22 uF 100V 20 10 sub 50 10 10 B 5 SL 10 B 50 10 B 8096 10 5 10 10 5 29 P PARTS LIST PCB ASSEMBLY 250425 01 Continued Indicates Commodore Stocked Part Number CONNECTORS Header Assy 20 Pin 903331 20 6 Pin Din C 903361 01 8 Pin Din C 325573 01 44 Pin Card Edge C 906100 02 7 Pin Din 251116 01 Plug Assy 9 Pin MINID C 251057 01 Header Assy 3 Pin 903332 03 Coil Inductor 2 2 H 901151 17 Line Filter Assy 251701 01 Coil Inductor 1 2 901152 01 Crystal 14 31818 MHz C 251467 01 Rocker Switch DPDT 904500 01 Voltage Regulator MC7812CT 901527 01 Voltage Regulator MC7805CT 901527 02 Modulator C 251696 01 Connector Panel Power ON OFF 251095 01 Cartridge Guide 326116 01 Fuse Normal Blo 250V
17. 9 U19 906109 01 MULTIPLEXED ADDRESSES IN PARENTHESES 1 7 39 DBO DB7 8 10 11 12 13 14 15 16 20 21 22 23 24 35 38 40 IRQ CS R W BA VDD COLOR SYNC LUM AEC PHO RAS CAS VSS PHCL PHIN AO A13 D8 D11 A8 A11 VCC Processor data bus connections Bidirec tional data Interrupt output Generates a interrupt signal to the processor indicating service is needed The light pen input can be acknowledged thru use of this interrupt Chip select input A low signal selects the VIC 11 Processor read write connection Bus available output A low pulse output indicates the VIC 11 chip wants controls of the processor network to process faster video operations that the system clock can handle 12VDC input Output contains chrominance color reference burst and color of display data Output containing video horizontal and vertical sync and luminance information Address enable output This is usually connected to the processor AEC input controlling the address bus AEC processor address bus disabled refresh ram AEC 1 processor address bus enabled This allows transparent refresh operations Phase O output Generated from the phase in signal Row address strobe output Selects proper row when addressing dynamic ram for read write operations or refresh Column address strobe output Selects proper column when addressing dynamic memo
18. D RAM 2114 150 NSEC 7416 Memory Controller 1N4001 1N914 r 4148 Zener RD6 8EB Zener RD3 0EB1 Zener IN754A Zener RD3 0FB2 Zener RD10ESB2 Zener RD13ESB2 Zener HZ11A1 Zener HZ12B2 Bridge Rectifier S2VB10 Bridge Rectifier DBA20B Bridge Rectifier DBA20C 250880 2501815 TIP29A 250476 2SD313E F 2501310 256945 2502458 NPN 900nN Ceramic r 470pF 50V Ceramic r 1000pF 50V Ceramic r 2200pF 25V Ceramic r 0 1uF 25V Ceramic r 22000pF 50VM Ceramic r 150pF 50V Ceramic r 220pF 50V 318012 01 906108 01 318014 01 318027 01 318013 01 901225 01 251913 01 901502 01 901522 06 901521 03 901521 30 251527 08 901453 07 906112 01 251527 09 390083 07 901453 09 901522 14 251715 01 900750 01 251819 16 251819 01 900927 01 906103 04 900927 02 906103 05 252313 63 252313 75 252337 61 252337 74 251026 01 251026 02 251026 03 902694 01 902693 01 902653 01 902694 02 902694 03 251294 01 902671 01 251526 01 252338 01 251069 04 251069 08 251069 12 251075 06 251304 71 251070 24 251071 26 Electrolytic r 2 2uF 50V Electrolytic 4 7uF 25V Electrolytic r 10uF 25V Electrolytic 1004F 16V Electrolytic r 220uF 25V Electrolytic a 1000uF 16V Electrolytic r 47uF 16V Electrolytic r 220uF 16V Electrolytic r 470uF 35V Ceramic r 1800pF 50V 10 B Electrolytic a 2200uF 16V Ceramic r 22000pF 25V M Trimmer 7 7 40pF Wound 20 ohm 5W 5 Carbon 390 ohm 1 4W 5 Carbon 560 ohm 1 4W 5 Carbon I
19. IN NIRS LED CONNECTOR 2 ALL RESISTORS ARE 4 WATT 16 8 A 3 A VE SHOULD BE TO DRIVE Y 5 d POWER INPUT ONLY DEVICES NDECATEDS L ox gt 7PIN MALE D N Q 2 I NOTES UNLESS OTHERWISE SPECIFIED X lt 46 NC C33 mh CARTRIDGE EXPANSION 9 6 32 B3 MAIN ASSEMBLY C64 BOTTOM CASE ASSEMBLY C64 B3 3PL SELF TAPPING 906883 01 SCREW PHILIPS M3X8 2PL 250785 01 TOP CASE 251447 02 SCREW PHILIPS BINDING HEAD 326166 03 KEYBOARD ASSY M3 X 6 250787 01 LED ASSY 252113 01 METAL ANGLE RIGHT 950150 03 FOOT SELF ADHESIVE 3PL 906883 01 252114 01 TOP SHIELD ASSY 250446 0 1 PCB ASSY C64C B3 252111 01 BOTTOM CASE SCREW PHILIPS SELF TAPPING M3 X 8 33 Commodore part numbers are provided for reference only and do not indicate the availability of parts from Commodore Industry standard parts Resistors Capacitors Connectors should be secured locally Approved cross reference for TTL chips Transistors etc are available PARTS LIST PCB ASSEMBLY 7250466 01 C64 B3 in manual form through the Service Department order part 314000 01 INTEGRATED CIRCUITS LSI CIA 6526 LSI VIC NTSC 6567 LSI SID 6581 R3 LSI CLK 8701T6 LSI CLK GEN 8701L6 LSI MPU 6510 PLA 825100 8700 001 SRAM 1KX4 Bit 200NS 2114 MEM SRAM 1KX4 Bit 200NS 5114
20. high level when reading This signal is usually decoded for read or write operations to memory 1 Phase 2 output The processor generates this clock signal from the phase 1 clock applied The two clock signals are 180 degrees out of phase The phase 2 clock is used in decoding I O and memory the positive half cycle Reset input interrupt A low pulse causes a jump to a subroutine specified by FFFC and FFFD which will initialize all proces sor controlled devices This occurs during a power up sequence SCHEMATIC 7251138 SHEET 2 OF 2 x wk w 3 x 55 02 sg sS es Rew IR SISI ow wee X w 55 82 2 lt 9 S R a 5 2 89 8 oo s EN A AA 35 S 4 2 9 x i 2 gt 8 us B gt 255 358 ys j 8 8 gt 5 M 2 9 gt ki N p 3 gt U 5 5 Na KA 87 4 52 A waj s S 3 zu gt gt w 2903 IWW Nid 9 31155552 R El y R 23 y 42 2 5 x x zi uj X 3 4 mR QN si TY C 2 T p gt 5 2215 58 E e ds AR 545 259 5 wh 4 0 4 6 HC E 3 FE 458
21. 0 Ceramic 1000 pF 50V 19 PARTS LIST PCB ASSEMBLY 7326298 Continued C Indicates Commodore Stocked Part Numbers CAPACITORS Continued CAPACITORS Continued r C38 Ceramic 51 pF 50V Electrolytic 10 F 25V 50 10 C39 Ceramic 1 pF Ceramic 1 pF 40 43 Ceramic 22 pF 50V Ceramic 22 pF 25V C44 Ceramic 47 uF 50V 20 Ceramic 1 pF 50V 20 C45 46 47 Ceramic 1 pF Ceramic 22 pF 25V C48 Ceramic 1800 pF 50 Ceramic 1 pF 50V 20 C49 Ceramic 470 pF 50 Electrolytic 10 F 25V 50 10 C50 Ceramic 22 uF Ceramic 1 pF 50V C51 Ceramic 47 uF 50V 20 Ceramic 1 pF 50V C52 53 Ceramic 470 pF 50V C54 _ Ceramic 2224 50V gt 2 22 Header Assy 20 Pin 903331 20 eramic 1 pF SR C57 Electrolytic 10 25V 50 2 _ 10 5 Din C 903362 01 C58 A 22 Edge C 906100 02 in Din C 906130 01 22 Plug Assy 9 Pin Rt Angle 906126 01 C60 61 Ceramic 47 pF 50V 20 2 2 77 C62 Electrolytic 10 pF 25V 50 10 C63 Ceramic 47 pF 5OV 20 64 65 Electrolytic 10 pF 25V 4 5096 Coil Inductor 2 2 H 901151 17 1096 Coil Inductor 3 0 901151 21 C66 67 Ceramic 47 uF 50V 20 Line Filter Assy C 906127 01 C68 Ceramic 1 pF Coil Inductor 1 2 901152 01 C69 C70 Mica 10 pF 500V 596 Crystal 14 31818 MHz C 900558 01 C71 Ceramic 1 uF C72 Ceramic 220 pF 50 R
22. 2 CMOS MEM SRAM 1 4 Bit 150NS 2114 15 MEM SRAM 1 4 Bit 120NS 2114 12 MEM DRAM 64 4 Bit 150NS MEM ROM Basic C64 2364B 161 MEM ROM Kernal C64 2364B 273 MEM ROM Char C64 2332C 250 LIN Dual Timer NE556 LIN CMOS SW 3UF 40668 TTL 74LS257A TTL 74LS373 TTL 74LS139 TTL 74 508 TTL 74LS258A TTL 7406 TTL 7416 TRANSISTORS Q1 NPN Power 2SD880 NPN Power TIP29A NPN Power 250476 NPN Power 2SD313 NPN Power 2SD1310 NPN Power 2SD1266 Q2 Q4 NPN Small Signal 25 1815 NPN Small Signal 28C945 NPN Small Signal 25 2458 NPN Small Signal 25 2785 Rect 1A 60V IN4001 Zener 5W 2 7 IN4371 Zener 2 7V Zener 2 74 Zener 2 7 Zener 2 7 Zener 2 7V Zener 2 7 Zener 5W 6 8V Zener 5W 6 8V Brdg Rect 2A 100V S2VB10 906108 01 906109 01 906112 01 251527 08 251527 09 Sub 906107 01 906114 01 901453 07 901453 08 Sub 901453 09 Sub 901453 10 Sub 390083 02 901226 01 901227 03 901225 01 901523 03 901502 01 315033 01 901521 29 901521 18 901521 03 390010 01 901522 06 901522 14 Sub 902694 01 902653 01 Sub 902694 02 Sub 902694 03 Sub 251294 01 Sub 902694 04 Sub 902693 01 902671 01 Sub 251526 01 Sub 251895 01 Sub 900750 01 906103 02 251286 04 Sub 251286 05 Sub 251286 06 Sub 906103 03 Sub 906103 04 Sub 906103 05 Sub 900927 01 900927 02 Sub 251026 01 DIODES Continued CR4 CR9 12 16 Brdg Rect 2A 100V DBA20B Brdg Rect 2A 200V
23. 251071 24 251072 26 251078 51 251069 03 Sub 251069 04 251069 08 251069 11 251075 06 900303 02 Sub 251075 07 34 CAPACITORS Continued C20 Film Rd 22uF 100V 20 Film 22uF 100V 20 Film Rdl 22uF 100V 20 C211 Ceramic 1uF 50V C15 Tant 4 7uF 16V 20 C13 C210 Electrolytic 10 7 25V 10 50 C13 Electrolytic 10uF 25V 20 Electrolytic 104F 25V 20 C24 Electrolytic Rd 224F 25V Electrolytic 224F 25V 20 C91 Electrolytic 100uF 16V 10 50 Electrolytic 1004F 16V 20 Electrolytic Axl 4704F 25V Electrolytic 10004F 25V Electrolytic 22004 16V Electrolytic 2 2uF Trim 6 5 40pF CONNECTORS CN7 Din Female R Angle 7 Pin Din Female R Angle 7 Pin Din Female R Angle 7 Pin CN6 Card Edge 44 Pin 4 Din Female R Angle 6 Pin Shield Type Din Female R Angle 6 Pin Shield Type 251875 01 900150 11 Sub 900150 12 Sub 900461 28 900410 13 900100 01 251079 16 Sub 251894 35 Sub 900100 24 251894 36 Sub 900100 40 251894 27 Sub 900101 49 900101 50 900101 33 251079 06 251029 02 251116 01 251116 02 Sub 251116 03 Sub 906100 02 252166 01 252387 01 CONNECTORS Continued Header w LKG Sil 2 54 CTR 20 Pin 903364 02 Header 20 Pin 903331 20 Sub Header Sil 2 54 CTR 3 Pin 903332 03 Din Female R Angle 8 Pin 325573 01 Din Female R Angle 8 Pin 325573 02 Sub Din Female R Angle 8 Pin 325573 03 Sub Din Female R
24. 4 71125502 28 7 7170 tw IUA or 42 20 5 2 md SPM xl OPOWIE 1 PARTS LIST PCB ASSEMBLY 250425 01 C Indicates Commodore Stocked Part Number INTEGRATED CIRCUITS TRANSISTORS Q1 Q2 4 6526 CIA C 906108 01 2364 Basic ROM C 901226 01 2364 Kernal ROM C 901227 03 2332 Char ROM C 901225 01 2114L 20 RAM 901453 01 6510 y Processor C 906107 01 7406 901522 06 sub 7416 901522 14 4164 200 nS 901505 01 7415257 901521 57 7415258 901521 58 7415139 901521 18 4066 901502 01 828100 PLA C 906114 01 6581 SID C 9061 12 01 6567 VIC II C 906109 04 LM556 901523 03 4164 200 nS 901505 01 7415257 901521 57 7415373 901521 29 741508 901521 03 4066 901502 01 7701 8701 C 251527 01 TIP29 A 902653 01 25 1815 902693 01 2 7 Zener IN4371 6 8V Zener IN754A Bridge S2V310 C 251026 01 sub DBA20B C 251026 02 sub DBA20C C 251026 03 Rectifier 4001 900750 01 IN4148 sub 1 9 14 906103 02 RESISTORS values are in ohms 1 4 W 596 unless noted otherwise RESISTORS Continued C23 C24 C31 33 34 C37 C38 C39 46 C48 C50 51 53 C59 C88 C90 C91 C93 C101 C102 C150 152 C153 C154 C200 C204 C205 CT1 33Q 8 Pin Bourns No 4308R 102 330 3 3KQ 8 Pin Bourns No 4308R 101 332 3 3KQ 10 Pin 1 4 W 1KQ 6 Pin Ceramic Ceramic Ceramic Ceramic Electrolytic Tantalum 25V A 25V 470 pF
25. 45450 q qala 11114111 7 4 v 99 Q iS lt 2 8 2 NI NI TNI IWR 692 z7v1 697 27WW 5Gy 77 24 NF 7 FLYA 7OqINO2 4404 7 2 GNO gx 1904 XIN 38 MAIN ASSEMBLY C64E BOTTOM CASE ASSEMBLY C64E o SELF TAPPING 7PL 906883 01 SCREW PHILIPS M3X8 250785 02 TOP CASE 251975 01 TOP SHIELD ASSY 250469 01 PCB ASSY 251447 02 SCREW PHILIPS USA BINDING HEAD 2 PL M3X6 252085 03 PAPER SHIELD 326166 03 KEYBOARD ASSY 251976 01 SHIELD PLATE BOTTOM 252111 01 BOTTOM CASE SELF TAPPING 906883 01 M3X8 SCREW PHILIPS 950150 03 3PL FOOT 39 PARTS LIST PCB ASSEMBLY 7250469 01 C64 E PLEASE NOTE Commodore part numbers are provided for reference only and do not indicate the availability of parts from Commodore Industry standard parts Resistors Capacitors Connectors should be secured locally Approved cross references for TTL chips Transistors etc are available in manual form through the Service Department order part 4314000 01 INTEGRATED CIRCUITS CR3 4 CR5 9 11 21 CR5 9 11 21 CR1 CR6 40 47 48 55 61 69 79 84 C70 71 C94 C86 88 8500 6526 8567 8562 8580 2332 ROM CHAR US PAL 128K ROM US PAL 4066 7406 741508 741514 8 01T6 2114 200 NSEC 6581 870116 64 x 4
26. 50 6567 VIC II LM556 4164 200 nS 7415257 7415373 741508 4066 741574 7415193 7415629 4044 2 4401 2 3904 29 2 2222 2 7 Zener IN4371 7 5V Zener IN755 IN914 Bridge Varo VMO8 Rectifier IN4001 C 906108 01 C 901226 01 901227 03 C 901225 01 901453 01 C 906107 01 901522 06 901505 01 901521 57 901521 58 901521 18 901502 01 C 906114 01 C 906112 01 C 906109 04 901523 03 901505 01 901521 57 901521 29 901521 03 901502 01 901521 06 901521 26 901521 68 906128 01 902652 01 902658 01 902653 01 902686 01 9061 29 01 RESISTORS All values are in ohms 1 4 W 5 unless noted otherwise RESISTORS Continued NOTE The input video line requires a 470 ohm 1 4 watt resistor soldered to ground RESISTOR PACKS RP1 2 RP3 330 8 Pin Bourns No 4308R 102 330 3 3KQ 8 Pin Bourns No 4308R 101 332 3 3KQ 10 Pin Ceramic 1 50 Ceramic 47 uF 5OV 20 Electrolytic 10 pF 25V 50 Ceramic 47 uF 50V 20 Ceramic 470 pF 50V Electrolytic 10 pF 25V 50 Ceramic 1 pF 50V Electrolytic 10 pF 25V 50 Ceramic 1 pF 50V Electrolytic 2200 pF 16V Film 22 pF 100V 20 Ceramic 1 50V 360 pF 50 Electrolytic 10 pF 25V 50 22 uF 50V Ceramic 47 uF 50V 20 Ceramic 1 pF 50V 47 pF 50 20 Electrolytic 10 F 25V 5096 Ceramic 1 pF 50 Ceramic 20 pF 5
27. 6161 01 903820 03 1001039 01 326114 01 950157 04 326131 01 326288 01 320974 251053 02 326189 01 904778 01 C64C PARTS LIST MAIN CASE ASSY Top Case Top Case E Keyboard B3 E BOTTOM CASE ASSY Top Shield Assembly B3 Top Shield Assembly E Medal Angle RT B3 Paper Shield E Shield Plate Bottom E Bottom Case B3 E Foot B3 E 250785 01 250785 02 326166 03 252114 01 251975 01 252113 01 252085 03 251976 01 252111 01 950150 03 C 64 BLOCK DIAGRAMI 1 MEG 2 Hz 90 A ADDRESS EXPANSION DECODIN CASSETTE 5 SA PORT PORT 6 7 MICRO DATA BUS PADDLES BASG ADDRESS BUS ROM 8K KERNAL ROM ES 8K MONITOR gt 64 KEYBOARD SERIAL xiii VLL 5 NEL CONTROL PORT There are three versions of the C64 The C64 with a five pin connector video output 326106 The C64 with an eight pin connector video output 251138 and the C64B which has improved system clock circuit design 251469 Most circuit theory explanations will be the same for all three versions Refer to schematic 326106 unless noted otherwise The Power Supply The external power supply generates a regulated 5VDC and 9VAC 5VDC is applied to pins 5 and 1 of CN7 on the C64 pcb Filtered by L5 C97 and C100 it is then controlled by on off switch S1 This 5VDC output supplies the microprocessor logic is applied to pins 6 and 7 of CN7 on the C64 pcb 12VDC 5VDC CAN and 9VDC unregu
28. A 39 PCB PARTSEIST GK obtutu ad 40 E BOARD LAYOUT u unu ua a UE DOMO cues ds 41 SCHEMATIG 2523 12 eA EEUU IA AS REVO Fer RIA VR Sas ANE 42 S 64 GENERAL DESCRIPTION MEMORY ROM MICROPROCESSOR DISPLAY COLORS CHARACTERS DISPLAY MODES RESOLUTION SPRITES SOUND KEYBOARD KEYS INPUTS OUTPUTS FEATURES PERIPHERALS POWER REQUIREMENTS COMPUTER e The All Purpose Commodore 64 is the complete computer for education home or small business applications Supported by quality peripherals and a full range of software the Commodore 64 is perfect for the family No other computer can offer such variety of uses and applications at such an affordable price e 64K RAM e 20K ROM Standard includes operating system and BASIC interpreter 6510A Microprocessor 1 02 MHz clock Compatible with the 6502 e 40 Columns X 25 lines of text e 16 Background border and character colors e Upper amp lower case letters numerals and symbols Reverse characters e All PET graphic characters e Text characters High resolution graphics e 320 X 200 Pixels e 8 independent sprites e Each consists of 24 X 21 pixels and up to 4 colors Each independently expandable horizontally and vertically Collision detection for sprite to sprite and data to sprite collisions e 6581 Sound Interface Device includes 3 independ
29. Angle 8 Pin 325573 04 Sub Submin D Male R Angle 9 Pin 906126 01 Mini Din 9 Pin 251057 01 Sub Switch Rocker DPDT 904500 91 Switch Power Rocker 252182 01 MISCELLANEOUS Xtal 14 31818 MHZ HC 49 U 251467 01 Xtal 17 73447 MHZ HC 49 U 251468 01 Inductor Coil 2 2uH 901151 17 Inductor Coil 1 24H 325570 01 Line Filter 5A 251701 01 IC Volt Regulator 12V MC7812CT 901527 01 IC Volt Regulator 5 MC7805CT 901527 02 RF Modulator NTSC C64 251696 01 F1 Fuse Nor Blo 250V 1 5A 903556 18 Use on F1 Fuse Clip 906102 01 35 T les giC e 2 VEO ss ij Oo 16 age 8 ASSY NO 250466 LEE 1986 Zm 94 0 15056 COMMODORE INTL COMMODORE 64 LL rue oe 7 L___l ii k 1 2 A og di ii A 3 BOARD LAYOUT 250446 PCB ASSEMBLY 36 SCHEMATIC 4252278 sheet 1 of 2 21 ES SNI 7 2 OWAJA ONINY 2 T gt fa y S AN E 143 k Nd kal NTSC N 3 ER S RZ i 24 e TY l A 1444 aS f 35 a 455054 sy Se Ut eR S UU 1 06 lt NY is af 3 Ar HY G 9 S gt 34 8 35522 lt 3430 53434309416554 32072 104 31
30. Ca 8 P HIRAM 33 4 8 CHARER 33 12 7 739972 FOR PAL 2 ALL CAPACITOR VALUES ARE IN J REJASTORS ARE WAIT iS NOTES UNLESS OTHERWISE SPECIPI D 122 74 06 423 21574 UJ 746508 9 5 5 TEES e 28 1 CARTRIDGE EXPANSION P N FEMALE CNS e 42 FOLD commodore COMPUTERS THIS FORM PROVIDES OUR CUSTOMERS WITH AN EASY METHOD OF SENDING IN DOCU MENT CHANGE RECOMMENDATIONS JUST REMOVE FILL IN AND MAIL THIS FORM OUR STAFF WILL REVIEW ALL RECOMMENDATIONS AND WHEN APPROPRIATE MAKE THE CHANGES TO THE DOCUMENT THANK YOU FOR YOUR COMMENTS DOCUMENT PART NUMBER TITLE DATE OF ISSUE USER S EVALUATION OF MANUAL Check Appropriate Block s Excellent Good Fair Poor 1 Complete Incomplete REASON FOR CHANGE RECOMMENDATIONS LI To correct error To improve content To improve quality C Other indicate below PAGE PARAGRAPH OR DRAWING AFFECTED BY RECOMMENDATION DETAILS DOCUMENT CHANGE RECOMMENDATION FOLD FOLD ul 13381S ANVdINOO COMMODORE BUSINESS MACHINES C 2654 West Chester PA 19380 Service Documentation Fold and Tape DO NOT STAPLE Fold and Tape 7 commodore COMPUTERS Paros 5 nem GE Manual Name Part Number Issue Date The return of this information is essential to the maintenance of your documentation If necessary docu ment updates a
31. DBA20C Brdg Rect 2A 100V DBA20B K15 Switching Prefmd IN4148 Switching Prefmd IN914 Switching Prefmd IN4148 251026 02 Sub 251026 03 Sub 251026 04 Sub 251819 01 251819 16 Sub 251819 22 Sub RESISTORS All are carbon 1 4 watt 5 unless noted C153 C204 C205 C23 C10 11 150 152 154 C37 C48 93 1 7 9 12 22 25 26 30 31 33 34 39 45 50 51 53 59 89 95 101 103 29 44 46 C1 7 9 12 22 25 26 30 31 33 34 39 45 46 50 101 103 29 44 C58 CF 82 Ohm CF 100 Ohm CF 180 Ohm CF 390 Ohm CF 560 Ohm CF 1K Ohm CF 1 5K Ohm CF 2 7K Ohm CF 3 3K Ohm CF 10K Ohm CF 47K Ohm CF 100K Ohm CF 470K Ohm CF 1M Ohm CF 470 Ohm 1 2W 5 NTWK 33 Ohm 8 Pin NTWK SIP 1K Ohm 6 Pin NTWK SIP 3 3K Ohm 8 Pin NTWK SIP 3 3K Ohm 10 Pin 51pF 5 SL Ceramic Disc 51pF 50V 5 SL Ceramic Disc 56pF 50V 5 SL Ceramic Disc 68pF 50V 5 Ceramic Disc 150pF 50V SL K 10 Ceramic Disc 220pF 50V 596 SL Ceramic 360pF 10 B Ceramic Disc 390pF 50V Y5P K Ceramic Disc 470pF 50V Y5P K Ceramic Disc 1000pF 50V Y5P K Ceramic Disc 1800pF 50V Y5P K Ceramic Disc 1uF 25V Y5V Z 80 20 Ceramic Disc O 14F 12V 20 Ceramic Disc 22uF 25V Y5V Z 901550 74 901550 49 901550 100 901550 57 901550 30 901550 01 901550 69 901550 23 901550 02 901550 20 901550 22 901550 07 901550 82 901550 84 901600 38 902422 03 902441 22 902442 29 902410 06 251078 24 251072 33 Sub 251072 19 Sub 900010 51
32. ER ns ns MW MAX MW 901505 01 HITACHI HM4864 3 335 330 901505 01 MITSUBISHI M5K416NS 20 330 275 1 2 3 4 5 6 7 8 901505 01 MOSTEK MK4564N 20 345 300 64K DYNAMIC RAM 901505 01 901505 01 HITACHI 4864 3 200 335 330 MATSUSHITA 901505 01 PANASONIC MN4 164P 20 330 275 27 5 901505 01 SIEMENS HYB4164 3 330 150 901505 01 HITACHI 4864 3 242 901505 01 TOSHIBA 4164 20 330 275 _ 22 WE R W CLOCK GENERATOR RAS CLOCK RAS GENERATOR MEMORY MEMORY ARRAY ARRAY DATA IN BUFFER DIN DATA OUT BUFFER POD CAS CAS CLOCK _ MEMORY MEMORY 7 e gt lt ARRAY 12 ARRAY i o VCC 56 A7o ra 210 u 4 oVSS 6 C MEMORY lt lt MEMORY 0 ARRAY o 0 2 9 gt o 2 DEC KY H e 9 o gt o a a lt FUNCTIONAL DIAGRAM SCHEMATIC 7326106 SHEET 2 OF 2 R TANDBY MW 6 V RF MI I MODULATOR OUT 390 L L FBIS 1 914 gt LES 2 5 gt 4 p C73 NE 3 a EBI 052 51 52 2 147 TI 4 od Lio gt 50v 2 5 EBIO 5 C50 C44 C34 1 2 50V 25V 12 7 OK YPN2222 AUD C37 OUT
33. IC U19 VIC II U9 U12 4164 RAM U21 U24 4164 RAM VR2 CR4 VR1 Check U9 U12 4164 RAM U21 U24 4164 RAM USE DIAGNOSTIC TEST DISK Check U1 U15 U7 Check U2 U7 Check 014 7415258 IC Check U26 7415373 IC Check C88 Possible Bad Connection Check 7 6510 MPU R1 Possible Bad Connection Check U7 6510 U20 556 IC Check U3 ROM Check U3 ROM Check U1 U28 6526 CIA Check C70 Check U3 ROM U2 CIA Check U19 VIC 1 Check UT U15 U7 and U4 14 64 TROUBLESHOOTING GUIDE Continued SYMPTOM POSSIBLE SOLUTION Cursor jumps back to home position Abnormal colors appear in the letters Different characters are displayed and cursor is locked when turned on and off System does not reset and the RESTORE key does not work White band scrolls down the screen 60 HZ HUM Cursor disappears after the system warms up SYNTAX ERROR displayed after System warms up Wavy screen after the system warms up The system resets when it warms up and long programs do not load Keyboard does not operate correctly when the system warms up Black band scrolls through screen when system warms up Cassette motor keeps running Cassette motor keeps running even after a program is done loading The TIP 29 transistor gets extremely hot and the fuse may possibly blow The cursor disappears when the cassette is plugged in Cassette runs extremely slow The p
34. K ohm 1 4W 5 Carbon 10 ohm 1 4W 5 Carbon 100 ohm 1 4W 5 Carbon 470 ohm 2W 5 Carbon 100 ohm 1 4 5 Carbon 10 ohm 5 Carbon 1 8K ohm W 5 Pack 1K ohm 6 PIN Pack 3 3K ohm 9 PIN Pack 3 3K ohm 8 PIN EMi Filter 270pF Ferrite Bead 2 Turn RF Choke Coil Line Filter Line Filter 8 Terminal 8 Terminal Crystal 14 31818 MHz Crystal 17 73447 MHz Jumper Wire Coil Inductor 2 2 Modulator NTSC Socket IC 16 Pin Socket IC 28 Pin Socket IC 40 Pin Fuse Normal Blo 250V 1 5A Fuse Clip Switch Rocker DPDT Switch Power Rocker Cartridge Guide Screw Self Tapping M3 X 6 7 Pin Din 6 Pin Din 8 Pin Din 44 Pin Card Edge 9 Pin Mini D 6 Pin Din Header Pin 20 Pin Header Assy 20 Pin Header Assy 8 Pin 8 Pin Din 9 Pin Mini D 291079 06 900100 11 900100 01 900100 40 900100 03 900101 52 900100 33 900100 18 900301 35 251069 11 900101 33 251074 09 251029 02 251756 02 251068 65 251068 69 251068 76 251068 101 251068 126 901600 38 251068 51 901600 14 251068 82 902441 22 902412 07 902442 29 251842 01 252214 01 252341 01 251878 02 251878 01 251467 01 251468 01 200018 15 901151 17 252405 01 904150 02 904150 05 904150 06 903556 18 906102 02 904500 01 252182 01 326116 01 906883 03 251116 01 252166 01 252168 01 906100 02 251057 01 252387 01 903364 01 903331 20 903332 03 252452 01 251057 02 CAPACITORS continued 40 T2 Min
35. PORT NN RAM CONTROL 1850 008181800080100000000001000100000 5 PIN VIDEO AND AUDIO OUTPUTS 8 PIN VIDEO AND AUDIO OUTPUTS CASSETTE INTERFACE KEYBOARD JOYSTICK amp PADDLE INTERFACES SERIAL INTERFACE USER PORT TROUBLESHOOTING GUIDE 22 2 BOARD IDENTIFICATION PCB ASSEMBLY 326298 01 BOARD PARTS TUS TS uu epulis ASSIGNMENTS OO SCHEMATIC 3261062222 4 PCB ASSEMBLY 250407 04 BOARD LAYOUT T MODULATOR SCHEMATIC 251025 SCHEMATIC 251138 _ PIN ASSIGNMENTS ONE 2 PCB ASSEMBLY 250425 01 BOARD LAYOUT PORTE R MODULATOR SCHEMATIC 251696 SCHEMATIC 251469 RR PIN ASSIGNMENTS oai dead bed ta Page W O R 11 12 13 14 17 18 19 20 L CONTENTS continued Title Page SERVICE REFERENCE DIAGRAM B 3 5 iere rer ert 33 PCB PARTS EIS 34 B 3 BOABD xt vt 36 B 3 SCHEMATICS 2252278 uu u u Made e 37 SERVICE REFERENCE DIAGRAM Ez ripe dope ETE Aaa ddd d
36. RTRIDGE EXPANSION 44 PIN FEMALE CNG I O and ROM Address Decoding and Expansion Port I O Address Decoding Logic 017 is a Programmable logic array PLA The output F5 on pin 12 called goes low when any of the 1 devices controlled by U15 are selected The addresses are listed below for each device VIC IC DOOO DO2E SID IC 0400 D7FF Color Ram D800 SDBFF CIA1 DCOO DCOF CIA2 0000 DDOF 1 DEOO SDEFF 10 2 DFOO DFFF ROM Address Decoding Basic ROM resides at locations 5 000 5 The output F1 pin 17 of the PLA U17 goes low when the BASIC ROM is selected The KERNAL ROM resides at locations SFFFF The output F2 16 of the PLA U17 goes low when the KERNAL ROM is selected The CHARACTER GENERATOR ROM resides at locations 0000 DFFF The output 15 of the PLA U17 goes low when the Character Generator ROM is selected The Expansion Port Connections The expansion port is an extension of the microprocessor address data and control bus ROML decodes addresses 8000 9FFF and ROMH decodes addresses 5 FFFF These are outputs from the PLA used to select the cartridge inserted in the expansion port I O 1 input from U15 decodes addresses DEOO DEFF I O 2 output from U15 decodes addresses DFOO DFFF C C64 CIRCUIT THEORY 88h S io 28 gt 5 5 cz c c2 pi
37. SERVICE MANUAL C64 C64C MARCH 1992 PN 314001 03 C Commodore SERVICE MANUAL C64 C64C MARCH 1992 PN 314001 03 Commodore Business Machines Inc _ 1200 Wilson Drive West Chester Pennsylvania 19380 U S A Commodore makes no express or implied warranties with regard to the information contained herein The information is made available solely on an as is basis and the entire risk as to completeness reliability and accuracy is with the user Commodore shall not be liable for any damages in connection with the use of the information contained herein The listing of any available replacement part herein does not constitute in any case a recommendation warranty or guaranty as to quality or suitability of such replacement part Reproduction or use without express permission of editorial or pictorial content in any matter is prohibited This manual contains copyrighted and proprietary information No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photo copying recording or otherwise without the prior written permission of Commodore Electronics Limited Copyright 1992 by Commodore Electronics Limited All rights reserved Printed in U S A CONTENTS Title SPECIFICATIONS PRODUCT PARTS LIST BLOCK DIAGRAM CIRCUIT THEORY POWER SUPPLY ZORRO EE CLOCK So ORA O ROM EXPANSION
38. UDIO IN O O LUMI OUT O COMP OUT 6 5 823 26 1 01 03 25 1684 OR FQIVALENT 204 2SC1730 OR EQI VALENT 305 25 460 OREQIVALENT 4 06 25 2120 OR EQIVALENT 5 01 H2 7 02 03 155119 04 05 15586 08 155174 06 155110 GALL CAPACITANCE VALUES iF LALL RESISTANCE VALUES 0 BALL INDUCTANCE VALUES H Ta he RF OUT 1 RECOMMENDED PC B HOLE CENTERS COMPONENT SIDE Sate Cee OPEN LPAL SCHEMATIC 7251138 SHEET 1 2 AUDIO VIDEO FEMALE DIN CNS Cb A 22 11 sa 4 ETI 2 za r TL 7 T xu rr al mes s 2 x EJ 5 wp B a 1 1 02 NTSC TM A 0 98MHx PAL B i FALAR 31818 MHB NTSC 7 734472 KSE 6569 REV3 FOR 019 8 18 MHE NTSC DO NOT VSE THIS CAPACITOR 7 00 MHE X VIC SID SHOULD HAVE SEPARATE GND RETURNS 6 019 6567 NTSC 6569 PAL NOTES UNLESS OTHERWASE SPECIFIED CARTRIDGE EXPANSION 44PIN FEMALE CN6 26 PIN ASSIGNMENT oo 4o01 Q S PIN ASSIGNMENT 1 2 3 4 5 6 7 8 9 10 U17 906114 01 PROGRAMMABLE LOGIC ARRAY PLA 2 U7 906107 01 6510 MICROPROCESSOR 7 20 22 23 21 24 29 30 37 38 39 40 01 RDY IRQ NMI
39. ent tone generators each with 9 octaves e Each voice includes programmable ADSR generator Attack Decay Sustain Release and control of sawtooth triangle square variable pulse and noise waveforms Full filtering capabilities with low high and band pass filters External sound input e Full size typewriter style design e 66 Keys total 2 Cursor control keys 4 Function keys up to 8 user defined programmable functions possible e Upper and lower case character set Graphic character set User port Serial port ROM cartridge port e 2 Joystick paddle ports e Video port C1530 Cassette drive interface port e Built in BASIC 2 0 over 70 commands statements and functions Full screen editor e C1541 Disk drive e C1530 Datasette e MPS 801 Dot matrix printer MPS 802 Dot matrix printer MPS 803 Dot matrix printer DPS 1101 Daisey wheel printer C1520 Plotter Printer C1702 Color monitor e CM141 Color monitor e 120 Volts 60 Hz Specifications subject to change without notice r l OR P px PARTS LIST TOP CASE ASSY Top Case Keyboard LED Plate Nameplate Lamp Holder Set LED Assembly BOTTOM CASE ASSY Bottom Case Foot Self Adhesive PCB Shield Plate PCB Insulation Sheet ACCESSORIES Users Manual Power Supply RF Cable Switch Box C64 326113 01 326165 02 326160 01 32
40. iable resistor is connected to adjusting knob on the paddle When the knob is rotated the resistance varies controlling the time constant of an RC network The Voltage developed across the capacitor is input to an A D converter internal to the SID chip U18 The digital output is stored in one of the SID registers The paddle position can be determined by the reading the contents of the appropriate register U28 is a 4066 CMOS switch The signals from the paddles are passed to the SID chip when the Enable inputs EO of 028 are high NOTE U1 port assignments are incorrect on schematics Refer to Keyboard Matrix for correct assignments 12 64 CIRCUIT THEORY 3 3K S 5 gt SRO IN 025 DATA En g zc zall 2 ld 2 _eN Nid 3933 3 4 H3sn 4 5 7 8 M D E F H J K L B e 3 D rd Be RID The Serial Interface and User Port Circuits The Serial Interface U2 is a Complex Interface Adapter CIA Parallel port signals PA3 PA7 control the serial bus inter face PA3 is the Attention ATN output This signal is inverted by U8 before being transmitted to a device on the bus PA4 is the Clock output Data transmitted from the C64 to a device on the bus is synchronized by this clock signal 98 inverts the output 4 is the data output U8 inverts this output also Data transmitted f
41. in board 250407 01 251138 CN5 Video port has 8 pins B 8 pin board 250425 251469 Reduced oscillator circuit B 2 8 pin board 250441 01 251469 Reduced Osc w component changes These boards are interchangeable with casework keyboard etc however care must be taken to provide the customer with a unit that is compatible with their monitor and cable When component level repairs are necessary be certain to acquire the appropriate part for the board you are repairing Most modulators are different as are many of the other components The 4th version of 64 board was recently developed and only a few may be in the field It is termed the 64B 2 circuits remain the same as the 64B Schematic 251469 with a few component loca tion changes 1 Resistors 28 29 30 36 48 were reduced to Resistor Pack RP5 2 Diodes CR100 105 are no longer piggybacked Their new locations are CR9 12 16 C64C BOARD IDENTIFICATION VERSION IDENTIFYING FACTORS PCB ASSY SCHEMATIC B 3 Only 2 RAM chips 250446 252278 U9 U10 E KERNAL BASIC ROMS 250469 252312 Combined 4 New IC memory controller U8 17 PIN 1 PIN 1 BOARD LAYOUT 7326298 01 PARTS LIST PCB ASSEMBLY 326298 C Indicates Commodore Stocked Part Numbers INTEGRATED CIRCUITS 6526 CIA 2364 Basic ROM 2364 Kernal ROM 2332 Char ROM 2114L 30 RAM 6510 y Processor 7406 4164 200 nS 74LS257 7415258 7415139 4066 825100 PLA 6581
42. lated are outputs that are derived from this 9VAC supply The 9VAC supply is made available on pins 10 and 11 of the USER PORT CN2 12VDC Generation is added to 9VDC through CR6 and rectified by CR5 The unregulated DC output is filtered by C88 and C89 then regulated at 12VDC by VR1 The regulated output is filtered by C57 and C59 The 12VDC supplies the VIC and SID IC and the audio amplifiers 5VDC CAN Generation is rectified by The unregulated DC output is filtered by C19 and C95 then regulated at 5VDC by VR2 The regulated output is filtered by C102 and C103 The output called 5VDC CAN 15 separated and individually filtered into two outputs called Vvid and Vc Vvid is the 5VDC supply for the video circuits and Vc is the 5VDC supply for the clock circuits 9VDC Unregulated Generation rectifies the 9VAC input The output is unregulated This supply powers the cassette motor transistor amplifier circuits and the RF modulator on the C64B version N 250 maOrxuarmmoozrxo e OU C64 CIRCUIT THEORY CR5 D 47 IN4OO 3 SOV 7057 C89 C88 22 CRG 50 400 5 1100 1 22 161 22 SHIELD GND L4 L5 E go IT 100V4 25 NC 9 7 e 4 5 123 POWER INPUT CN7 7 PIN MALE DIN LI 2 2 4 CAN VvID G4 CG3 1427 L 1 47 25V 7 50V 50V 20 207 2 5 op II Ene eve CO5
43. nd changes will be distributed to registered persons Subsequent versions and editions of this document must be purchased Name Company Street GRUT ZIB M X o n Tear Here COMMODORE BUSINESS MACHINES C 2654 West Chester PA 19380 Service Documentation z commodore 1200 Wilsan Drive West Chester 19380
44. o __ 32 41042 416 41042 4164 2 M q He 29 B J Me 29 pa 6567 Da VAC 8 5 DOOO 07 RAM Control Logic U13 and U25 are multiplexers The address outputs from the microprocessor are passed to RAM via U13 U25 when the output Address Enable Control AEC from the VIC IC is high When AEC is low the VIC IC outputs refresh addresses on pins 24 31 AEC goes low when the system clock phase 2 is low Since all decoding occurs when phase 2 is refresh is transparent to the processor Eight 4164 DRAMS provide 64k bytes of memory One 2114 RAM 06 provides 512 bytes of memory allocated for screen color data storage C64 CIRCUIT THEORY F ES RF MI R8 Sia Aun Rl P Video AUDI 13914 E RE ET 2 T 2222 50v SZ LE R49 470 L3 C7 POT TH GND NIG 31354 Nid S Otanv Mo 5 i 52 Lee CG I 27 404 T o 25V 5 EBIO FE L 12 I 470 op Ilo 2 R7 CC pins AUD e C37 OUT IM 1 gt 1 R38 10 2 IK 25 ELECTRO LYTIC 25 ELECTROLYTIC 5 Pin Video and Audio Output Circuits Pin 15 of the VIC IC is the sync luminance output Pin 14 is the color out
45. ocker Switch C 904500 01 C73 Ceramic 150 pF 50V Voltage Regulator Sn AMIE MC7812CT 901527 01 4 3 B Voltage Regulator eramic pF C79 Ceramic 510 pF 50V MEETS 29557125 gt AE Modulator C 326130 01 C81 Ceramic 20 pF 50 C82 Ceramic 1 uF 50V Fuse Normal Blo 250V 1 5A C83 Mica 33 pF 500V 596 C84 Ceramic 1 pF 50V Ferrite Bead 903025 01 C85 Ceramic 47 pF 50V 20 C86 Mica 39 pF 500V 5 Connector Panel C87 Ceramic 1 pF ON OFF Joystick 326299 01 C88 Electrolytic 470 uF 50V Cartridge Guide 326116 01 C89 Ceramic 1 uF 50V Shield Box C 326265 01 C90 Electrolytic 470 pF 50V Shield Cap 326267 01 C91 Electrolytic 100 pF 16V C92 Ceramic 22 uF 50 C93 Ceramic 1800 pF 50V 20 21 PIN ASSIGNMENT 1 2 3 4 5 6 7 8 9 PIN ASSIGNMENT U1 U2 906108 01 6526 COMPLEX INTERFACE ADAPTER CIA 20 21 22 23 24 25 26 33 34 35 38 39 40 U18 906112 01 VSS PAO PA7 7 TOD VCC IRQ R W CS FLAG 02 DBO DB7 RES RSO RS3 SP CNT Ground Connection Parallel port a signals Bidirectional parallel port Parallel port b signals Bidirectional parallel port Handshake output A low pulse is generated after a read or write on port b Time of day clock input Programmable or 60hz input input Interrupt output to microprocessor input IRQ READ WRITE input from microproces
46. put A composite video out put is created by mixing sync luminance and color The composite output is applied to the RF modulator and also passed to the monitor connector CN5 on pin 4 The color output is not made available on the monitor connector as on the 8 pin version and the RF modulator mixes audio with the com posite video producing the TV RF output unlike the 8 pin version RF modulator which creates the composite video output C64 CIRCUIT THEORY os 25 8 5 tn AUDIO VIDEO 8PIN FEMALE DI CNS AYD 8 Pin Video and Audio Output Circuits Refer to schematic 251469 U19 is the Video Interface Chip VIC Sync horizontal and vertical and luminance video is output on pin 15 This signal is passed to pin 2 of the RF modulator Color is output on pin 14 and passed to pin of the modulator Light Pen inputs are sensed the VIC IC on pin 9 U18 is the Sound Inter face Device IC SID The audio output is on pin 27 and audio input is on pin 26 The RF modulator mixes sync luminance color and audio out generating a TV composite signal on pin 5 The RF modulator also passes the VIC outputs to the monitor connector CN5 Audio out on pin 27 is amplified by Q2 and output on pin 3 of CN5 Audio in is applied to pin 5 of CN5 then to pin 26 of the SID IC Inputs from paddles connected to one of the control ports are monitored by the SID IC on pins 23 and 24 10 64 CIRCUIT THEORY 9 UNREG Q
47. rogram seems to load but will not run Check U7 6510 MPU Check U6 2114 RAM U16 4066 IC Check RAM Check U20 556 IC Check External Power Supply VR2 5V Regulator Check U1 6526 CIA Check RAM U3 ROM Check External Power Supply U31 74LS629 IC 030 74LS193 IC Check U7 6510 MPU U3 ROM Check U1 6526 CIA U3 ROM Check External Power Supply C90 C88 CR4 VR2 5V Regulator Check U7 6510 MPU Check Cassette Port for Shorts R4 Possibly Open Check U7 6510 MPU Check U7 6510 MPU 15 64 TROUBLESHOOTING GUIDE Continued SYMPTOM POSSIBLE SOLUTION When loading from a cassette the SYNTAX ERROR message is displayed DEVICE NOT PRESENT ERROR is displayed when disk is used Disk drives continue to search when trying to load When loading from disk and any key of the 4th row of the keyboard is pressed the cursor goes to home position When loading from disk a FILE NOT FOUND message is displayed OUT OF MEMORY ERROR is displayed when disk is used Check U20 556 IC Check U1 6526 CIA U7 6510 MPU R28 R29 R30 Check U2 6526 CIA Check U20 556 IC R35 Possible Bad Connection Check U4 ROM U2 6526 CIA Check U20 556 IC C64 BOARD IDENTIFICATION To date there are 4 versions of 64 PCB assemblies in use VERSION IDENTIFYING FACTORS ASSY 7 SCHEMATIC 7 Original 5 pin board 326298 01 326106 CN5 Video port has 5 pins A CR 8 p
48. rom a device on the bus to the C64 is synchronized by a clock generated by the transmitting device The Clock signal is input on PA6 Data transmitted from a device on the bus to the C64 is input on PA7 When a device on the bus wants to communicate with the C64 SRQ IN goes low indicating service is requested The User Port Parallel port B of U2 PBO PB7 is made available on the user port Parallel data transfers with exter nal devices are made very easily through this parallel port SP2 and SP1 are bi directional serial ports 1 and CNT2 are bi directional synchronizing clock signals for each serial port 13 64 TROUBLESHOOTING GUIDE SYMPTOM POSSIBLE SOLUTION Blank screen on power up Out of memory error on power up No cursor displayed Intermittent blank screen Powers up with graphic display and blinking cursor Powers up with all the characters displayed as blocks Intermittent display Powers up with PRESS PLAY ON TAPE message and the display blanks On power up the cursor locks up When RETURN is pressed after a run command the cursor goes back to home position Poke command does not work Joystick does not operate correctly Wrong frequency No character lettering is displayed on the screen Graphic characters instead of letters displayed Power up message appears but no cursor Check External Power Supply U4 KERNAL ROM U17 PLA U7 6510 MPU U3 ROM U8 7406
49. ry for read or write operation Ground connection Color clock 14 31818 MHZ NTSC Clock input Determines the dot transfer rate to the display Dual function address bus During a micro processor read or write operation AEC 1 AO thru A5 are inputs used to address 47 internal registers When AEC 02 is low then AO thru A13 are outputs used to refresh dynamic memory Data bus extension Color display memory data Address bus extension Color display memory addressing 5VDC input SER AL BUS 6 PIN FEMALE DIN CONTROL PORTI CONTROL PORT2 KEYBOARD 20 P N MALE USER PORT 24 MALE EDGE MALE 589 MALE 538 CN 4 CN 8 CN CN I CN 2 SCHEMATIC 251469 SHEET 2 OF 2 6 h 2 2 2 122 C 2E3Yo Ys 5 9 4447 gt Cass RB EF 3 j 7S 0 A c 6 50 54 470P 47 ajopr x 23223532223 0 9 3 5 m R 570 M 5 922 RT ay 99108088 000 WZ 25 o Pd AY 250 86 an Q3 3 2 1 EE AR T 010 4 SOUND CARRER SELECT PAL OA Y 22 C C C C C _ SHORT 3 5 FOR G M OPEN 4 FoR PAL 227 E T 3 ALL CAPACITOR VALUES ARE
50. sor s R W output Chip select input A low pulse will ac tivate CIA Negative edge sensitive interrupt input Can be used as a handshake line for either parallel port O2 clock input Connected to processor common O 2 clock Bidirectional data bus Connects to pro cessor data bus Low active reset input Initializes CIA Register select inputs Used to select all internal registers for communications with the parallel ports time of day clock and serial port SP Serial Port bidirectional connection An in ternal shift register converts micropro cessor parallel data into serial data and visa versa Count input Internal timers can count pulses applied to this input Can be used for frequency dependent operations 6581 SOUND INTERFACE DEVICE SID CAP1A 1B 2A 2B RES 02 R W CS 4 GND DO D7 POT Y POT X VCC EXT IN Audio out Vdd Capacitor filter connections Reset input low pulse initializes the SID Processor phase 2 clock input Processor read write input Chip select input Address lines from processor Dc ground connection Data Bus connections Input to a A D converter used to detect the value of a variable resistor Commonly connected to game paddles Same as POT Y 5VDC External audio input Audio output Should be AC coupled to audio amp 12VDC 9 PNI NIG 3W NJ d IOHLNOJ ba 2 ub NI
51. ui S pt 7 I sse A TRIG NC R35 B 470K CARTRIDGE EXPANSION 3 CNG Keyboard Joystick and Paddle Interface Circuits Keyboard Interface U1 is a Complex Interface Adapter CIA Both parallel ports are used to decode the keyswitches on the keyboard Parallel port A signals PAO PA7 are outputs Parallel port B signals PBO PB7 are inputs A O bit is shifted through the parallel port A when a key is depressed on the keyboard the O bit is returned on one of the parallel port B inputs A program in the KERNAL ROM generates the shifting O bit output on parallel port A and decodes the signals returning on the parallel port B inputs Depressing the restore key causes 020 to trigger 08 6 goes low generating a Non Maskable Interrupt NMI at the processor This causes the processor to execute a subroutine which initializes the 1 Interfaces If the STOP key is depressed at the same time BASIC flags are also initialized C64 CIRCUIT THEORY o RESTORE NMI 6510 5V KEYBOARD MATRIX Joystick Interface U1 also controls the joystick Parallel port A accepts inputs from the B joystick connected to control port 2 Parallel port B accepts inputs from the A joystick connected to control port 1 When the joystick is moved up down left right or the fire button is depressed a ground potential is applied to the appropriate input of U1 Paddle Interface A Var
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