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I bought the Rominator for my 128k motherboard. I have the 820-0086-C board. Although I've checked every signal (rom address & data pins to cpu pins + ROM.E) and the A17-A19 address & R/W jumper wires. I don't get any boot beep and after 5-8 or so seconds I get a checkerboard video. I don't...

I have a silly question. But first, I am grateful for all the work put into the memory expansion board detailed here in another thread. Thank You! I have been designing logic circuits since the RTL / ECL days, modifying motherboards and also do assembly language on multiple platforms. So I know...