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truxpin
1st September 2009, 08:02 PM
Tiger Heli bootleg ?

Sprites and large heli in intro screen don?t look quite right
Missing about every 4th column of pixels.
Suspecting a possible bad eprom or bad ram
Verify eproms against mame sets all but one of the eproms verify ok
A manual compare on the eprom that failed to verify reveal only minor
differences possible undumped rom ??? This is one of the main program
eproms so not the problem.
After testing the boards with various eproms missing found the sprite
Generation is done on the top board time to get out the scope and have a probe
Around the ram on the top board found the 2114 labelled IC39 at location M5
Had all of its data pins stuck remove the ram fit a socket and replacement ram
Sprites now good game plays ok time to tidy up the boards and replace a
few broken off and damaged caps.
Another board rescued from the tip.