pacoarcade
Professional
Hello, some time ago I got a working - but in pretty bad shape - Sunset Riders PCB. Yesterday I was playing it and suddenly the game froze. After powering the board again it reported bad 12F and 12G srams. Running it again the game freezes but the music continues playing, and some times it automatically reboots.
It seems to work fine after some time powered off, then after 8 minutes or so the game fails, when powering off and on it fails again, so this leads me to think some chips may fail with higher temperature.
Voltage is fine (5.00V at the edge, I also rised it a bit to get 5.00V at ).
- Those SRAM chips test ok in my Minipro, but they can fail under other conditions, isn't it? so I've ordered a replacement.
- This board runs an overclocked 12MHz Motorola 68000 instead of proper 16MHz one.
I've tried piggybacking 13F and 14F LS245 with no success.
Any idea to diagnose the problem while the sram replacements arrive?
It seems to work fine after some time powered off, then after 8 minutes or so the game fails, when powering off and on it fails again, so this leads me to think some chips may fail with higher temperature.
Voltage is fine (5.00V at the edge, I also rised it a bit to get 5.00V at ).
- Those SRAM chips test ok in my Minipro, but they can fail under other conditions, isn't it? so I've ordered a replacement.
- This board runs an overclocked 12MHz Motorola 68000 instead of proper 16MHz one.
I've tried piggybacking 13F and 14F LS245 with no success.
Any idea to diagnose the problem while the sram replacements arrive?
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