Tandy PC-4 Computer and Cassette Service Manual
Contents
1. x YUTPP U R TRS 80 PC 4 Pocket Computer and Cassette Interface 26 3650 26 3651 26 3653 Catalog Number CUSTOM MANUFACTURED FOR RADIO SHACK A DIVISION OF TANDY CORPORATION 5595 1995 0 95 96 1 SPECIFICATIONS Kevboard lavout ON INS lt P7 P9 7 Cs EJ x PA P5 P6 lt Cs 8 Pq ru r EPIS n Ems TOTO M cid 9 Display Display tube AC 61255 Display method Display capacity Fundamental calculation functions Built in functions Commands Program functions Calculation range Program system 5 x 7 dot matrix liquid crystal 11 columns alphanumeric characters and symbols Negative numbers exponentials parenthetical addition subtraction multiplication and division with priority sequence judgement function true algebraic logic Trigonometric inverse trigonometric functions angular units degree radian gradient logarithmic exponential functions square root powers conversion to integer deletion of integer portion absolute value symbolization designation of number of effective positions designation of number of decimal positions random numbers INPUT PRINT GOTO FOR NEXT IF THEN GOSUB RETURN STOP END RUN LIST LIST A MODE SET VAC CLEAR CLEAR A DEFM SAVE SAVE A LOAD LOAD A PUT GET VER KEY CSR LEN MID VAL 1 10 to 9 9999992. 2 12 151588 2 z gi C 002 A 2RAM Sw gt gt MODE SW 25 T 25 vD INVERTER TC3OHOO4F 7Pin VDDI I4Pin GND 2 2 26 3651 From personal computer PC 4 VDD3 VDDI CE2 LA OP 04 GND POWER sw PP p FBR221 CD003 M To optional lcu character printer Type AA x2 DAL Ground for l f N s lt OO m static electricity a Zsl UdSwn am 47000 pF 50V IOK So 2 3 x TC4069BP T5 5 5 BOT 6 N 9 REMOTE Fo 8 GRAY MIC xX HD43110 22 pF 10 GND IV PRINTED CIRCUIT BOARD 2 Pay whe RS LA N da STA 26 35653 pod Exploded View 26 3650 OOOD 2795 cc VI PARTS LIST 1 26 3650 Manufacturer Description RS Location Part Number LSI HD61913 CPU 20013583 LSI HD61914 RAM 20013516 i MOS IC TC40HOOOF il 21003956 EA MOS IC TCA0HO04F 21003964 Diode 151588 i no li 23003031 Rotary volume 1 150Kohm 27709150 Resistor Chip ERJ 8GCSJ391 390ohm 35 1 8W 27909051 Resistor Chip RC315B10K J 10Kohm 5 1 8W 27908195 Resistor Chip RC315B220K J 200Kohm 5 1 8W 27908071
3. 5 4 0839 THEN 1 20 C C 12345x 12345 234 345 SOR 0 SQR 2 SOR 30 SIN 3012 30 FOR H 5 TO 4 D D RND 5544 4455 H NEXT H 40 A 1 E A A A A A A A 50 60508 3 EAN 2 60 RETURN 10 123 O H amp J O MID 1 3 4 ABC GOTO 44 1 15 THEN 1 IF Xx 125 THEN 30 L GOTO ER IF a H amp J ABC THEN 1 IF RND C 5 s 1894 4034 THEN IF RND D 2 55000 THEN 1 GOTO 45 GOTO 20 RETURN 1 GOTO 15 1 201 A A A 9999999000 NEXT ABCDEFGHIJKLMNOPORSTUVWXYZX FOR A 1 TO 201 F 9999999000 A THEN ER NEXT A IF ABCDEFGHIJKLMNOPORSTUVWXYZ X THEN ER PRINT TEST Notes 1 P2line 10 cannot be fully entered if you use a one key command e g SHIFT J for IF Therefore enter the program manually without spaces 2 line 10 amp can entered a EXT mode set b press the the red S key c Press tne U key d EXT mode reset Testing Procedure Save the test program on a cassette tape through a cassette tape interface unit bv the operation SAVE A EXE 1 2 3 4 5 6 7 8 9 10 11 12 Install a RAM module into the test unit PC 4 Push the ALL RESET button on the bottom of the test unit Connect the PC 4
4. 68K J Manufacturer Part Number Resistor Carbon Film 180Kohm 1 4W 5 R 25 180K J Resistor Carbon Film 220Kohm 1 4W 5 R 25 220K J Resistor Carbon Film 330Kohm 1 4W 5 R 25 330 K J _ 26010918 Resistor Carbon Film 680Kohm 1 4W 5 R 25 680K J 26011710 Resistor Carbon Film 4 7Kohm 1 4W 5 R 25 4 7K J 260 820Kohm 1 4W 5 R 25 820K J 16118 Crystal Oscillator 32 768 2 KF 38G 71100138 Resistor Carbon Film da Resistor Carbon Film 30 100Kohm 1 4W 5 R 25 100K J o Resistor Carbon Film 260099 120Kohm 1 4W 5 19 Case Sub Ass y Upper A35413C 2 63344334 Plate LOGO A36263 2 63344360 Plate Power ON OFF Model Name A45867 2 63344350 Sheet Insulation Aluminum 63345140 Case Upper G426 A1803B 1 63329912 Case Sub Ass y Lower A21315B 2 63344343 2 pese Case Lower G426R 1804 2 63347241 Plate Rating G426R A46351 1 USA Canada 63347250 UK Belgium Australia Foot Rubber G426 A45990 1 63329990 Plate Ground For Printer 63347260 Spring Battery Contact G67 A43656 1 60006091 Description RS Location Manufacturer Part Number Spring Battery Contact C G164 A43733 1 Bolt HEX 6 5 X 8mm Printe
5. RAM2 User s Area FFF Note The above addresses are for cases when one word is 4 bits 5 SERVICING 5 1 Disassembiv Remove two screws from the back Lift and slide down the lower case Remove the batterv cover Extract batteries Remove eight screws from the guide plate Remove the guide plate 5 2 Trouble shooting Note Numbers in CAUSE column denote order of possibilitv A Displav LSI s to function CPU RAM1 OPERATION TROUBLE Turn the power switch on Push the ALL RESET button on the back of the computer Dot display cannot be shown B Key Entry LSI s to function TROUBLE No display at all or unusual indication 1 2 LCD 3 Heat seal Some dots cannot be displaved Kev input operation Displaving Storing entered numbers or characters No entrv atall CPU ka Wiring between CPU and keyboard Cursor moves but entered number or character RAMI cannot be displayed CPU Wiring between CPU and RAM 1 Only characters can be entered CPU Wiring between CPU and keyboard C 1 1 Remove optional RAM module if equipped 2 Push the ALL RESET button on the bottom 3 Operate DEFM 62 EXE 4 Write the following program 10 FOR 1 TO 87 20 1 30 PRINT A 1 40 NEXT 50 PRINT RAM OK 60 END 5 After writing the above program confirm t
6. 9 Case Soft G426TA A35897 1 UK Belgium Australia Cap For Connector G426 A46150 1 63352220 63332410 gt N CONTENTS 1 POCKET COMPUTER 26 3650 amp MEMORY MODULE 26 3653 SPECIFICATIONS 2 L Sie Da a Made ie uku Ara 1 BLOCK DIAGRAM 5 5044 a ai 3 CPU Central Processing Unit 3 1 Features ww v te e a a DS 4 3 2 CPU Block Diagram 4 3 3 CPU Signal Descriptions 5 RAM Random Access Memory 6 SERVICING b 1 Disassembiyi LI HR ram gesi D 7 5 2 Troubleshooting va ie ele a RU ace PUR 8 A Display zd 8 B Key Entry Rs ERO a a 8 RAMT y uusha n ae a ahah selale ante 9 D BRAM u a a end 9 E Discrimination Between CPU and RAMI 10 5 27 test Programmi a EE rac S ne eR RU 11 PROGRAM COMMAND LIST 13 ERROR MESSAGE LIST vela ln Re OLET X ras Ro RA Ra 15 II CASSETTE INTERFACE 26 3651 SPECIFICATIONS 2252 2222 EB ss ei 16 BLOC
7. 999 x 10 and 0 internal calculation uses 12 mantissa positions Stored system Program language Number of steps Program capacitv Number of memories Number of stacks Power supplv Power consumption Batterv life Auto power off Dimensions Weight BASIC Maximum 544 steps maximum 1 568 steps when optional RAM pack is loaded Maximum 10 programs PO through P9 Standard 26 expandable to 94 maximum 222 memories when optional RAM pack is loaded and exclusive character variable Subroutine 8 levels FOR NEXT loop 4 levels Numerical value 6 levels Calculation elements 12 levels Two lithium batteries CR2032 Maximum 0 02W Main frame oniv approximatelv 360 hours continuous use Power is turned off automatically approximately 7 minutes after last operation 9 8mmH x 165mmW x 71mmD 3 8 H x 6 1 2 W x 2 3 4 D 1164 4 1 oz including batteries 2 BLOCK DIAGRAM LCD AC 61225 R1 R15 KEYBOARD RAM1 HD61914 RAM2 HD61914 EXPANSION RAM MODULE LCD 5 X 7 dots CPU CMOS VLSI one chip microprocessor unit RAM and contains self control circuit 12 digit dot matrix display A character or a number is displayed in Stores data and program Each RAM has 1K bytes BK bits capacity 3 CPU Central Processing Unit HD61913 3 1 Features CMOS one chip CPU Built in ROM 100864 bits Built in RAM 1896 bits Built in display driver Memory ba
8. F comparison expression THEN line no command RETURN GOSUB line no variabie RETURN Causes control to jump to the line number following THEN or executes the command following if the result of the comparison is true Causes control to proceed to the next line number if the result of the com parison is false Calls out the subroutine of the desig nated line number for execution After the subroutine is executed control returns to the GOSUB statement by the RETURN statement to proceed to the command following that statement Signifies the end of a subroutine returns control to the command statement function next to the GOSUB statement FOR 1 e2 STEP 3 v denotes a numerical variable and e1 e2 and e3 represent a numerical ex pression respectively 13 Declares the beginning of a loop in which numerical value v changes from initial value e1to terminal value e2 in increments of e3 The loop is repeated e2 el 1 times e3 between the FOR and NEXT statements If the increment e3 is omitted e3 is regarded as 1 Signifies the end of a FOR loop if the result of v plus e3 is equal to or smaller than e2 the loop is repeated again If it is greater than e2 control proceeds to the line next to the NEXT statement Execution stop Stops the execution of a program tem porarily to bring the system into a key in wait state The execution can be c
9. K DIAGRAM i A A 16 ESI THD43440 eoe SN Sak RA cane ae 17 CIRCUMFERENCE CIRCUITS 4 1 Clock Pulse Generator IT 18 4 2 Remote Control Circuit 60mm 18 4 3 Shaping Circuit and Filter 18 SERVICING 5 1 Disassembly eR c Pa aie B PIE 20 5 2 Troubleshooting udo a RUE kdar EUR 21 III CIRCUIT DIAGRAM 26 3650 a elin e E N aues abs A 26 3651 ME IP PUEDES 23 IV PRINTED CIRCUIT BOARD 26 3650 Yuka G Eus tae Sok dal Ta OR TERR DR S CRI an eee 24 26 3651 24 26 3653 5 VOR ek a 25 VI PARTS LIST 206 3650 i dvd a voee 26 26 3651 iei EM VR E a a CEA LAUREA OTT 29
10. KIZ c5 5 i v2 b5 43 dos v3 td o o oja eu ey 7 o n o a5 5 V4 to O s X d fO P TO U LA ye S e4 4 dea v5 UE IE MM Se ee d4 f daq 9 0 sw lya 27 4 4 8 Hp MN S 5 ba Bra IT 8 ke EXT EI F2 RUN WRT DEG GRA RAD TRs2 ATA PRT STOP 44 47 dag HD 61913 I6 5 K3 b6c5b5 c4 04 b3 bl 5458 30362 cl bi 50 3 9351443 1 224 3 O k6 5343 l a3 A KB LE 2 55 462 0 O kg 52909 65525 99909 45445 c2 14 2 8 Wavetorm tor dis b2 38 T O KI2 playing a O on the I SgNDv 6 most significant digit Ris H e 60 gt GND di ldai Ro bit fop l 01 644 fcp 2OOkHz 30 R2 R3 220K ui O trt codi R4 oznam L mejl IE I GND ZI 2 r7 li 45 R 2 l D2 2 lt 53 Die 6 mr 5 I a6 S VDDI E NERS pe cc 2 22 B d6 c6 I nn nn l2 b6 H 14 i I5 E 61914 on the bottom RESET 0 ia HM 8 08 i9 S MODE 20 50 ze 21 EVL AHAA OOBC5 gt
11. OR 1 TO 2 FOR J 1 TO 2 FORK 1 TO 2 10 20 30 40 50 60 70 80 90 100 110 FOR L 1102 NEXT L NEXT K NEXT J NEXT GOSUB 40 GOSUB 50 GOSUB 60 GOSUB 70 GOSUB 80 GOSUB 90 GOSUB 100 GOSUB 110 RETURN PRINT END END RETURN RETURN RETURN RETURN RETURN RETURN RETURN After execution of this program display should show END If the above manual calculations 1 are done but the program 2 cannot be executed RAM 1 may be faulty 0 5 3 Test Program i No Program PO 10 VAC B Pm 20 ron 1 1 TO 2 FOR 1 2 TO 3 FOR K 3 TO 4 FOR L 6 TO 4 STEP 1 30 NEXT L NEXT NEXT J NEXT i di 40 GOSUB 50 PRINT TEST 1 OK END A E 50 GOSUB RETURN _ a is 60 GOSUB 70 RETURN 70 GOSUB RETURN i 80 GOSUB 90 RETURN 90 GOSUB 1 RETURN RE f 10 IF AB THEN 20 _ 5 e 20 IF lt THEN 30 25 GOTO 1 i 30 IF gt A THEN 40 385 6001 40 IF 4127 lt AB IF AB gt 12 THEN 50 45 1 50 IF 123 123 IF 123 lt 123 THEN 1 1234 gt 123 THEN 1 70 IF 123 lt 1234 THEN 1 m 80 IF 123 gt 456 THEN 1 7 90 IF 456 123 THEN 1 7 mE 100 GOSUB 42 RETURN P2 10 IF SIN 195 COS 234 TAN Is 34 EXP 1 LOG 163 Note 1
12. a P C B Assembly G1002RA 60900010 d 28 2 26 3651 Description LSI HD43110 Interface Drive IC TC4013BP Flip Flop MOS P IC TC4059BP Inverter MOS Transistor 2SA1015 Y Remote PNP Transistor 25 1815 Remote NPN Capacitor Ceramic 22pF 50V 10 HE405JSL220K Capacitor Ceramic 560pF 50V 10 HE408JYB561K 28186191 Capacitor Ceramic 1500pF 50V 10 HE405JYB152K Capacitor Ceramic 3300pF 50V 10 HE705JY B332K Capacitor Semiconductor Ceramic 0 047 50V 20 SCA5F1H473Z Resistor Solid 26Mohm 1 8W 20 ERC 18GM2665 Relay FBR211CD003 M Capacitor Electrolytic 22 F 10V 10 28180136 28180152 27901476 31206057 28040954 Diode Silicon 152075 21 Resistor Carbon Film 390ohm 1 4W 5 R 25 390 J E Resistor Carbon Film 2 2Kohm 1 4W 5 R 25 2 2K J Resistor Carbon Film 5004 8 1Kohm 1 4W 5 R 25 1K J 2 2 Resistor Carbon Film Resistor Carbon Film 26008115 22Kohm 1 4W 5 R 25 22 K J Resistor Carbon Film 2 00 4 33Kohm 1 4W 5 R 25 33K J 600851 DE ERES T d Resistor Carbon Film 26008913 47Kohm 1 4W 5 R 25 47K J 29 Description Resistor Carbon Film 68Kohm 1 4W 5 R 25
13. a or data e Verify the data Undefined line number error No designated line number for a GOTO statement or a GOSUB statement e Correct the designated line number Argument error For a command or function that e Correct the argument error requires an argument the argument is outside the input range 4 Variable error Attempt was made to use a memory which has not been expanded Attempt was made to use the same memory for a numerical variabie and a character variable at the same time e Expand the memory properly e Do not use the same memory for a numerical variable and a character variable at the same time Nesting error A RETURN statement appears other than during subroutine execution A NEXT statement appears other than during a FOR loop or the variable of the NEXT statement is different from that of the FOR statement Subroutine nesting exceeds 8 levels FOR loop nesting exceeds 4 levels Option error e Remove the unnecessary RETURN statement or NEXT statement e Reduce the subroutines or FOR NEXT loops to within the maximum levels L Execution is performed in the PRT mode or an option command such as SAVE is executed when no printer or tape recorder is connected mA e Connect a printer or tape recorder Release the PRT mode From Personal Computer PC 4 II CASSETTE INTERFACE 26 3651 1 SPECIFICATIONS Output termina
14. area on tape LOAD f filename l Calls out the program from the tape and loads it to the currently designated program area SAVE A filename Records the programs in all program areas on tape at the same time LOAD A f filename l Calls out all programs from the tape and loads them to the respective program areas PUT filename Records the data in the variable on tape variable GET f filename l variable Calls out the data from the tape and loads it in the variable VER filename Checks to confirm that the programs or data have been recorded on the tape properly 7 ERROR MESSAGE LIST Cause Corrective Measure Memory overflow or system stack overflow e Program cannot be written due to insufficient number of steps or memory cannot be expanded Stack overflow due to a complicated calculation formula Syntax error A mistake has been made in writing the program etc The left side format is different from the right side format in a substitution statement etc ka Mathematical error The calculation result of a numerical expression is 10190 or greater Outside the input range of a numerical function The result is indefinite or impossible e Clear unnecessarv programs or reduce the number of memories e Divide and simplifv the numeri cal expression Correct the error in the input program etc e Correct the calculation formul
15. ble Remote control impossible No function at all Open circuit of jack cable Replace jack cable Check the LSI terminal signals If signals are normal replace the LSI Head of the cassette tape Clean the head Output level of tape recorder Turn the volume control to max Check to see if there is an open circuit in jack cable Replace jack cable Does the tape recorder function properly Test the cassette recorder with a tape of music Clock pulse Replace crystal oscillator Signal of the LSI Click sound of the relay at saving or loading Shaping circuit If C3 is normal replace the LSI If click cannot be heard check signal C1 of the LSI If signal C1 is not output from the LSI replace the LSI If C1 is normal remote control circuit mav be faultv Check to see if there is no open circuit in jack cable Clock pulse Is PC 4 properlv connected Poor contact of connector Clock pulse TM Replace jack cable Crystal oscillator Connect correctly Replace connector Crystal oscillator SCHEMATIC DIAGRAM 1 26 3650 Ki K9 gt i O O Qo O T O o K7 o G o rece K6 K5 QU K4 ES EN amp RAAAANAA A K DWOOEWEE NN OgGMU 2 wooow tr t Ki d5 A das 24 vi
16. ckup function Clock 400 kHz Internal machine cycle 200 kHz Minimum instruction execute time 10uS O O O O O O 3 2 CPU Block Diagram Control signals L ROM Instruction Decoder RAM ROM Internal Bus System Program SIBU IS Aejdsig Address Control 1043409 sng 314 p sng exeg Keyboard ALU Control U Keyboard Signals 3 3 CPU Signal Descriptions Signal Name In Out Function In Out Data bus Also designates RAM address while signal OP is HIGH Not used Power switch input signal LCD drive voltages These voltages are generated by connecting external resistors to VDD2 In Out By connecting 56 kohm external resistance between these terminals clock pulse is inter nally generated LCD display signals 0 zero volt power source Chip enable signals CE1 selects RAM1 at HIGH level while CE2 designates RAM 2 at HIGH level 5 5V input 5 5V output from the LSI Stays 5 5V at power ON Goes to OV at power off or APO Auto Power Off Clock pulses When the signal is HIGH the data bus becomes address bus for RAMs and also becomes the command code for the optional cassette tape interface 4 RAM Random Access Memorv HD61914 is 1K byte RAM and contains self control circuits The following shows a memory map of RAM 1 and RAM2 optional RAM pack 000 System Memory 21F 220 RAM 1 7FF 800
17. hat the remaining program step is 0 6 Execute the program and confirm the display counts up from 1 to 87 and shows RAM OK by every depression of the EXE key If the above operations cannot be made RAM1 may be faulty D RAM2 Optional RAM module 1 Install the RAM module in a PC 4 2 Push the ALL RESET button on the bottom 3 Operate MODE 1 and confirm that the remaining program step is 1568 If the display shows the remaining step 544 RAM2 is not functioning b Wiring between CPU and RAM2 has failed 4 Operate DEFM 190 and confirm the display VAR 216 5b Write the following program 10 FOR 1 TO 215 20 A 1 30 PRINT A 1 40 NEXT 1 50 PRINT MODULE OK 6 Execute the program and confirm the display counts up from 1 to 215 and shows MODULE OK by every depression of key If the above program is not performed the RAM2 optional RAM module may be at fault E Discrimination Between CPU and RAM 1 If a test unit passes the preceding checking procedures and a problem still exists follow the calculations 1 Manual Calculations Below Perform the following calculations manually 1 2 3 4 5 6 7 8 Correct answer In DEG mode TAN COS SIN LOG 100 Correct answer RC 0 0174550616 If the above calculations cannot be made the CPU may be faulty 2 Program Execute the following program after pushing the ALL RESET button on the bottom F
18. l White mini plug output impedance approx 40 kohms output level 3 50mV Input terminal Black mini plug input impedance approx 20 kohms input level 2 5 50V Remote control terminal Gray sub mini plug 24V 1A or less Data recording format Kansas City standards 300BPS Power source For remote control Two AA size dry batteries Power consumption 0 3W Battery life Approx 7 hours for continuous operation Dimensions 173mmW X 114mmD X 31 5mmH 2 BLOCK DIAGRAM FILTER Eu p Mic LSI CE2 HD43110 SHAPING 77 CIRCUIT EAR 1 OP REMOTE CONTROL m gt REMOTE ano CIRCUIT LSI Kansas City standards applied cassette tape interface LSI Transfers serial data by the following frequencies Data 1 2 340 Hz CRYSTAL Data 0 1 170 Hz OSCILLATOR Filter Circuit Converts LSI s data pulse into AC waveform for tape recorder Shaping Circuit Converts AC waveform data from tape recorder into square pulse for the LSI 4ap109ay 33325525 OL LSI HD43110 HD43110 is a cassette tape interface LSI with Kansas City standards which transfers data between the CPU and cassette tape recorder Data 0 and 1 are transferred in serial as 1 170 Hz and 2 340 Hz frequencv pulse respectivelv Data is transferred at 300 bits per second The following lists the functions of each terminal of the LSI Signal Name In Ou
19. m Resistor Chip RC315B65K G 68Kohm 2 1 8W 27908551 Resistor Chip ERJ 8GCSJ225 2 200Kohm 5 1 8W 27909485 Capacitor Chip 21 103 15 0 144 F 15V 20 71032167 Capacitor Chip C3225C0G1H222K i 20001407 2 200pF 50V 41024 Capacitor Chip CM21CH102K25V 1 000pF 25V 4102 ez Kom VEN SX aa nns pcc pee Battery Rithium CR 2032TRBULK 38001329 Resistor Chip ERJ 8GCSJ563 56Kohm 1 8W 4596 27909400 Capacitor Electrolytic SRA35VB 4R7 28014082 4 7 F 35V 10 Manufacturer Ref Description RS Location Part Number Capacitor Electrolvtic SRA16VB 10 28014040 104 16V 10 LCD LD B8105A 33306768 EET ens Connector 1260 019 12504 35113639 Seal TH heat TH 07 1 56004397 OO Ov Plate Reinforcement G420 A35393 1 63327140 Tape LCD Adhesive G110B A44636 1 63275120 pres Plate Heat Seal Insulation B G420 A45916A 2 Spring P G195 A33138A 1 Holder PCB A1820D 2 Spring Battery A G272 A33938A 1 Spring Battery 272 A33939 1 Spring Battery C G272 A33940 1 Plate Battery Insulation G272 A45154 1 Cushion Battery G1002 46287 1 Holder Battery G420 A45884 1 Plate Insulation B G420 A45918 2 Plate Insulation A G420 A45921A 1 Plate Insulation E G420A A46326 2 Plate Ins
20. ontinued by pressing the key Execution end Signifies the end of a program the System returns to its pre execution state The execution of a program once ended cannot be continued even if the kev is pressed Data clearing VAC Clears all variable data for a program Program listing LIST line no Displavs a listing of all the statements in a program from the designated line number downward program LIST A LIST A Displavs a listing of the statements in all listing programs Program RUN RUN line no Causes a program to start from the execution designated line number Program CLEAR CLEAR Clears the currently designated program erasing area of a program CLEAR A CLEAR A Clears all the programs designation MODE degree 4 radian 5 or gradient 6 Angular unit MODE 4 Designates trigonometric angular units as 6 Format En Designates the number of effective designation Fn positions or number of decimal positions N 0 lt 9 for the displayed numerical value Character LEN character variable Calculates the size of the character function variable Extracts n characters from the mth character in the exclusive character variable S MID m n VAL character variable Converts the numbers in a character variable to a numerical value Option use SAVE filename Records only the program in the currently designated program
21. r Fixing Nut Hex 10mm Outside X 5mm Inside X 3 6mm T Washer 11 2mm Outside X 6 5mm Inside X 0 8mm T 63249297 53012735 Sheet Insulation Alminum For Lower Case 63345090 Plate Ground For Computer 63345100 M2 X 4 Yellow A G321 A44793 1 Spring Switch Contact A4532C 1 Screw Tapping Flate Head Connector 12Pin Female 3639 1 1 126D 019 12N04 Connector 12 Male 03244 1260 019 12 22 351032 Cord Connection For Cassette 009237 PLGW 1596 01A 27 Y Cover Battery G426 A21328 1 63329890 Knob Slide Lock Free B G426 A35453 1 63329950 Knob Slide Power ON OFF G426 A35452 1 63329940 Capacitor For Connector 64268 A45915 1 63346370 Plate Computer Unit LOCK FREE i 29960 G426 A45988 1 es Plate Slide LOCK FREE Knob A45987 1 63329970 m 964 RE NN fa l a 62747023 63282780 Screw Tapping Flat Head M2 X 7 Yellow A G426 Spring Earth A46432 1 Z Description Screw Tapping Flat Head T Manu facturer RS Location Part Number M2 Yellow A G320 A44793 11 63291680 Screw Tapping Flat Head M2 X 4 Black A G324 A33953 3 Screw Tapping Flat Head 2 X 6 Black C G302 A44793
22. t Function OSC Clock pulse 32 768Hz input VDD 3V output CONT The LSI functions only when the terminal is HIGH 3V input Chip enable terminal The LSI is designated from PC 4 when the terminal is HIGH Strobe pulse input from PC 4 Serial data input output OV input terminal Data input from cassette tape Data output to cassette tape Remote control auto stop signal output 4 CIRCUMFERENCE CIRCUITS 4 1 Clock Pulse Generator 32 768 Hz signal is generated by the crystal oscillator and is shaped by the inverters PKS 22272741 U S El L rn L 4 4 2 Remote Control Circuit REMOTE When signal C1 is HIGH transistors Q1 and Q2 turn on causing relay RY to be switched on so that the REMOTE terminal becomes active 4 3 Shaping Circuit and Filter Filter waveforms k approx 2 4 kHz 1 2 kHz Data output C2 from the LSI is integrated waveform d and shaped into an AC waveform waveform e by capacitor c1 and resistor r1 OV Se Nee Input signal from tape recorder f is integrated by capacitor c2 and resistors r2 and r3 waveform g The waveform Q is cramped between 3V and 0V by diodes d1 and d2 e 5 1 Disassembly ogee 5 2 Troubleshooting TROUBLE CHECK POINT SOLUTION SAVE impossible LOAD impossi
23. to a cassette tape interface and a tape recorder which contains a test program cassette tape Load the test program from the cassette tape by the operation LOAD A After loading the Program change the PC 4 to WRITE mode by the operation 1 and confirm that the remaining program step is 789 Operate O RUN mode selection Execute PO Program number O Confirm the display TEST 1 OK Clear the programs PO to P5 Example to clear P2 SHIFT 2 P2 designation b 1 WRITE mode selection c CLEAR erasing P2 Note SHIFT is the red S button Change the PC 4 to RUN mode by EXE Operate DEFM 176 EXE Execute P9 Confirm the display TEST OK L2 6 PROGRAM COMMAND LIST input statement INPUT variable string Character variable KEY PRINT output control function output element G 254 Causes data to be entered from the board during execution of a program The program execution is stopped until after the end of input Reads a character entered during execu tion of a program and assigns it to a character variable Since the program is not stopped by this command nothing is assigned to the character variable if no key entry is made Outputs the designated output element CSR 0 11 Displays from the designated nth position Branching GOTO line no variable Causes control to jump to the designated line number I
24. ulation F G420 A46327 1 63248131 63297621 s 8 2 Panel Lower G1002R A35387A 3 Canada USA Panel Lower G1002T A35387 5 UK Belgium Australia Screw for Case B G420 A45919 1 Cap Connector G420 A45915 1 21 6 8 a m Manufacturer Ref Description RS Location Part amber 12 Case Sub Ass y Upper A35384C 3 63344183 13 Window G420 A35388 1 63326920 rez 14 Frame e Display G G1002 A45881 4 63344190 i aa ar z Al S amp 15 Key Contact Rubber A G420 A35389 1 63326970 hes 16 Knob Slide 6420 5391 1 63326980 ja 2 17 dii Switch Contact G310 A45208 1 63298310 P ee Switch G420 A46325 1 i 63339930 18 Film Common G420 A21302 1 63327290 ale I e MAMO 19 Spacer l G1002 A46286 1 63336870 EE Lt 20 Flat C G321 A33793 3 63282790 21 Spring Ground G1002R A46432 1 63345 St E 254 S 22 Rubber Key Contact B G420 A35390 1 63327030 2 A A Top Set for PC 4 4 GX 1002AA 00018003 k bil SS HOP SA Or ET ie Fu Case Soft ft 8 TQUE RA A35692 1 Canada USA 63344241 bae yakma lar PROS ECCO mii EN ss sas Case Soft G1002TA A35895 1 63352170 re
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