Brian E. Brzezicki
Copyright 2013
Version 1.00 06/24/2016

Disclaimer
Use this at your OWN risk, do NOT sue me if it breaks your board... if your doing this your board is probably already broken though ;)

Game Board #1 6/24/2016

Problem:

  • Game does not work, static colorful garbage on the screen

Troubleshooting/dianosis steps:

  1. Clocks look good
  2. CPU 7EFH is soldered in, removing and installing a socket so I can plug my Fluke 9010A Z80 pod in
  3. RAM on swimmer is at 0x8000 - 0x87FF - ram long - OK
  4. Video RAM 0x8800 - 0x88FF - OK
  5. 0x9000 - 0x93ff -ok
  6. ROM is 0x0000 - 0x7FFF
  7. ROM 0x0000 - 0x0FFF from fluke - no matching checksum will pull - does not match anything, pulled all 8 code roms, NOTHING matched
  8. Graphics roms 15 and 14 read good, 13 which had been obviously re-burned was not
  9. I had another board the user sent me from same customer, those roms read bad too, (at least the first game rom I tried and gfx rom 13).k What is going on here?
  10. Reburned ALL code roms, as well as ROM 12 and 13 
    ROMS
9l 0x0000 - 0x0FFF - 4051
k1 0x1000 - 0x1FFF - f2f8
j1 0x2000 - 0x2FFF - 0b3b
FH1 0x3000 - 0x3FFF - 79c9
e1 0x4000 - 0x4FFF - f297
d1 0x5000 - 0x5FFF - 9cb7
bc1 0x6000 - 0x6FFF - 2b59
a1 0x7000 - 0x7FFF -- b27f
  11. Put back original CPU, boots OK
  12. Game works!