R-Type V-RAM A Error

AtomicBomb

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I've got a legit r-type board throwing a V-RAM A error at me, but I'm having trouble determining which RAM chips this corresponds to on the board. According to the bill of materials and my research, I've got...
Main board:
4x tmm2018d-35 @ ic36-39
2x tmm2016ap-12 @ ic21-22
2x tmm2018d-55 @ ic23-24
2x d43256c-10 @ ic70-71
Secondary board:
4x d4364cx-15 @ ic33-36
Rom board:
2x d4364cx-15 @ 1F and 3F

Trying to get something on the order asap, which might be the most likely candidate?
 
Last edited:
Most likely it's one of the D43256C RAMs at IC70–71 on the main board, those handle video RAM. Grab replacements for those first. If that doesn't clear it, next suspects are the D4364C chips on the secondary board. Check for good 5V, clean sockets, and no cracked solder while you're at it.
 
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