so far, I've disconnected the 16k ram, and put in a known-good 1k, and I've added a zigg.net composite mod. output is blank white, sometimes a moving black and white pattern.
the power connection is verry dodgy, so my next plan was to test voltages and possibly fit a traco power regulator. might need to replace the power connector, as i can't get it to tighten up.
i'd better read through this thread and see what's already been tried!
edit: I'm up to date! I guess the important bit is that all 3 known-good ICs didn't fix the problem. When I received it, it had a modulator fitted, so I guess that didn't work, either.
It also sounds like the ROM might have more issues than needing help with it's maths. What kind of EPROM would be good for creating a replacement?
edit 2: 27C64's seem like a good bet, judging by other posts. No-one seems to mention access times, tho. Is 300ns okay, or is that too slow?Statistics: Posted by voorsk — Wed Apr 10, 2024 12:11 am
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