the MCS-80 Test Board User Manual
Contents
1. casseagias rs RBR7RERSKARS R i P Bp TN oe E GN gt ae n Ee yn avy 7 and RES rd i h 7 O a 4 _F hd EE test board amp rN S356 ye Ceen aa i8080 CPU Test board User s Manual 2014 Nov 21 Ver 2 0 by molka Overview The 18080 test board is intended to test the working condition of Intel MCS 80 system s 18080 and compatible CPUs The board consists of the base components of MCS 80 an 18224 clock generator provides 1 11MHz clock that is slow enough for all kinds of 8080 CPUs an 18228 system controller and bus driver and a 40 pin ZIF socket for 18080 CPU provides easy replacement of the CPUs A 2716 2KB EPROM holds the test program This program handles 4 push buttons as input and 8 LEDs as output devices The board requires a single 5V power supply 450mA provided through a mini USB connector The board contains the DC DC converters needed for providing the 5V and 12V powers required by the CPU There is a power failure indicator and protection circuit implemented on the board When the input power level is less than 4 2V the failure indicator LED is illuminated and the 12V level is limited to 4V Address data chip select control and power lines are attached to the three 16 pin expansion headers so that the board may be used for other projects Board layout and parts CPU pin 1 We IOOLX3L MGT 0 WUT UI Reset bu2. o the socket Ensure proper orientation to prevent damage to the test board and CPU Pin must be at the upper right corner next to the release lever of the ZIF socket Then lock the socket by moving the level down into the lock position Connect the power through the USB connector The three power indicator LEDs should be illuminated Ifthe CPU is in working condition the 8 output LEDs should be flashing 1s on 1s off pattern At this point the CPU can be considered WORKING Congrats When you press any of the four push buttons SW1 4 the output LEDs copy the state of the buttons duplicated in the low and high nibbles Releasing the buttons causes one of the four different animation sequences to start corresponding to the button released last Troubleshooting After connecting the power supply the power indicator LEDs remains off or power failure indicator LED is illuminated Turn off the power immediately This may be caused by The power supply is unable to provide enough current Check that it can provide at least SOOmA 800mA to 1A recommended Thin poor quality USB cable can also cause this problem There is short circuit fault in the CPU The 8 output LEDs do not start flashing Press the Reset button If the output LEDs continue to remain off then the CPU may be faulty Tested CPUs Manufacturer Intel Clones AMD CCCP ECG MEV Mitsubishi National Semic
3. onductors NEC Poland Siemens Signetics Tesla Texas Instruments Tungsram Variant 8080A 8080A 1 8080A 2 8080A 9 AM9080A AM9080A 2 1820 1701 KP580BM80A ECG8080A 8080A PC MSL8080AP INS8080AD INS8080AN D8080A D8080AFC D8080AFC 1 MCY7880 SAB8080A C MP8080A1 MHB8080AC MHB8080A TMS8080ANL 8080A 8080APC Expansion The following lines are connected to the expansion heads H1 3 ADDRESS A0 12 DATA DO 7 CHIP SELECT Y 1 7 IOR IOW MEMR MEMW INTE INT INTA RDYIN WAIT STSTB RESET OSC 2 TTL POWER 5V 5V 12V Memory and IO organization Memory map 64KB 0000h O7FFh N 0800h YO 2KB test board s base program from A 0000h to O7FFh 1 x 8KB occupied by the test board program First expansion block must contain byte 55h at address 2000h byte AAh at address 2001h Expansion code start at 2002h 1 x 8KB for expansion program 6 x 8KB free blocks I O map 256 Byte Used to address LEDs and buttons on test board 00h 3Fh 40h Free I O address from 40h to FFh FFh Thanks to CPUShack for review and advises Feel free to write an e mail to me at molnar kalman freemail hu or send a PM to molka at CPU World forum if you have any duestion
4. tton Power failure indicator Baaltemet HEYDE TA Ad A LL LA OOOO z BAARBREBRAARERH AAABEAB di 2222s Z ASAS Z gt be 5 gt 1C4 i2716 R8R7RGERS5R4R3R2R1 ae BEBEEBAEBE mini USB i 5V power i supply iNtel gue TA connector and compatible CO gt BOBO CPU VU test board 394 3L O4 3b oa 30e 4 Output LEDs amp Power Power Input buttons indicators switch mini USB 5V power supply connector The board consumes around 450mA current so a computer USB connector or cell phone charger that can provide at least 500mA 800mA 1A is recommended can be used as power source Power supply can be turned on and off by the sliding switch at the bottom right corner Three LEDs next to the power switch indicates power level of 5V 5V and 12V The board contains a Power Up reset circuit but can be reset manually by pressing Reset button ARed LED near the Reset button indicates power failure A40 pin ZIF socket for the 18080 CPU Ensure proper CPU orientation The pin 1 is at upper right corner next to the release lever of the socket Eight output LEDs shows simple animations flashes indicate that the CPU is working There are four push buttons for testing inputs and changing animation sequences Usage Before changing the CPU in the ZIF socket make sure the power is off All power indicator LEDs should be off Place the CPU int
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