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Shinydaz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shinydaz Quote  Post ReplyReply Direct Link To This Post Topic: hypersports
    Posted: 14 Feb 2018 at 3:39pm
Completely missing sprites on every event.



Pulled out the probe and found a dead output on pin 8 and stuck output on pin 6 on a 74ls21 @ f19 on lower board.



Replaced bad chip and we now have visible sprites but with errors.



Replaced mask rom g17 on lower board to fix all sprite errors but still has jailbars on long horse.



Replaced mask rom g19 on lower board to complete the fix.




Edited by Shinydaz - 14 Feb 2018 at 10:52pm
Hunting for a pole position !!
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John Bennett View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Bennett Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2018 at 10:25pm

Forgive my ignorance, but is that some kind of in-circuit 74xx circuit tester?
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Shinydaz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shinydaz Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2018 at 10:48pm
No its just a cheap out of circuit logic tester(minipro).
I normally just cut them out, but I find these chips come out without to much of a fight on hypersports boards, so decided to
desolder it intact. I could have used my in-circuit logic comparator if I really wanted to, but little need when the probe showing dead outputs.

Edited by Shinydaz - 14 Feb 2018 at 10:48pm
Hunting for a pole position !!
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