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hypersports |
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Shinydaz ![]() Senior Member ![]() ![]() Joined: 09 Jul 2015 Status: Online Points: 1732 Feedback: 5 |
![]() ![]() ![]() ![]() ![]() 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 |
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Hunting for a pole position !!
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John Bennett ![]() Senior Member ![]() ![]() ![]() ![]() ![]() Joined: 06 Apr 2015 Location: Newcastle Status: Offline Points: 4369 Feedback: 5 |
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![]() Forgive my ignorance, but is that some kind of in-circuit 74xx circuit tester? |
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Shinydaz ![]() Senior Member ![]() ![]() Joined: 09 Jul 2015 Status: Online Points: 1732 Feedback: 5 |
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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 |
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Hunting for a pole position !!
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