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Hmmm..I think I realise what I've done. I've been using 2764s! It should be 27128s. D'oh.

I've successfully reproduced the 200E VDG daughterboard, and wanted to try it out with the 200E 'firmware'. So I've flashed IC18/IC34 and replaced it on the motherboard. I've also done IC17/IC37, but I don't think that is important unless doing an EXEC48000? For some reason, despite trying a few dif...

Boards arrived today. Have put one together and blown an EPROM as per the image I found either here or Simon's main site (Rom26.ic1). The results are rather different to what a real 200E displays - I presume because I have a normal D64 BASIC ROM in place. 200E_normal.jpg 200E_inverse.jpg More charac...

Just resurrecting this thread - and am I glad I found it!! Was about to order some PCBs to try this out, but fortunately took one last look tonight and realised that the EPROM chip enable I'd deduced from what I could see on the board was wrong. The details above make perfect sense, and look to enab...