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Perhaps I'm missing something, but I can't make out where your connection/driver for the nG pin of the DRAMs comes from. Is there a missing gate?
Yes, there's likely a gate (or two) missing off the schematic (well I said rough schematic). I may have gated R/W with CS from the 138. The DRAM doesn't output until it see RAS/CAS, and the write signal is already determined (no bus contention), so the pin was maybe grounded. I dismantled the board a few years ago so I can't check.