(Topic ID: 222797)

NEW! Williams System 3-7 In-Game Test ROMs

By pincoder

5 years ago

Topic Stats

336 posts
48 Pinsiders participating
Latest reply 4 months ago by DumbAss
Topic is favorited by 75 Pinsiders

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Linked Games

Algar Williams, 1980
Alien Poker Williams, 1980
Barracora Williams, 1981
Black Knight Williams, 1980
Black Knight Limited Edition Williams, 1981
Blackout Williams, 1980
Contact Williams, 1978
Cosmic Gunfight Williams, 1982

There are more than 8 games linked to this topic.
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Topic poll

Sort: Original A-Z Score

“Which test ROMs have been the most useful for you?”

01a-leds 2 votes

13%
01b-bus 0 votes
01c-transceivers 0 votes
02-blanking 0 votes
03-cmos-IC19 4 votes

25%
04-ram-IC13 3 votes

19%
04-ram-IC16 3 votes

19%
05-displays 2 votes

13%
06-switches 1 vote

6%
07-bounce 0 votes
08-interrupts 1 vote

6%
09-lamps 0 votes
10-solenoids 0 votes
11-sounds 0 votes
12-sounds2 0 votes
clear_cmos 0 votes
edit_cmos 0 votes
init_cmos 0 votes

(Multiple choice - 16 votes by 5 Pinsiders)

This poll has been closed.

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LTSpice sim of BLANKING keep-alive in test ROM (resized).png

0C200399-BFEC-4C5C-9381-C10E3CD5EC73 (resized).jpeg

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Repaired one mpu already with this.
Next mpu on the bench is doing this: kinda counting something like 5 4 3 2 9 8 7 6 0 pause and then repeat. the leds do some blink pattern

any ideas?

IC34 on this board is 7447APC
I've tried different 2114s and 5101s. The ones on the board test good with my neoloch inquisitor tester. The PIAs also test good.
The other tests don't appear to run correctly either. Random character on the display or both lights or no lights.

This board had a bad address driver (bottom right corner, N8T97N) and apparently there was an issue with the socket. I reflowed the socket and it appears to be working now.
Thank you for providing the test roms.

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