Agent x-- Cloak and dagger

xcelite

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Aug 25, 2009
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ok intresting problem here i have a c&d pcb that showed up on my bench it had 4 problems lines in screen random sprite flickers and some sprites jump. I found 6 bad bit ram 4116's by using the self test mode. After those were replaced the self test says all is good. now here is the crazy part i still have jumping sprites in attract mode and play mode. If i run test mode after the game is running test mode is good. if i boot the board with test mode engaged then i get ramdom bit map errors. so i hooked the fluke up and it reads the bit map ram fine. Any idea's
 
Tried tha fluke again on the bit ram pcb and now it's getting timeout errors
Changed the timeout to 60000 and still won't do anything. I think that it's a clock issue
 
did some more on this last night and im gettin 2.5mhz clock signal on the 6502. Still cant get the fluke to run on this pig. any ideas?
 
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