My Epson QX-10 on YouTube

I regard the QX10 as being one of the best CP/M machines. It's quite solid design. And I _love_ those 1/3 height floppy drives (I assuem you've examined one, the head psoitoner is a voice coil with optical feedback, like a miniature RK05 positioner. AI am sure capacitors are easier to find than PSUs... A word of warning. The video daughterboard can take either 16K (4116-like) or 64K (4164-like) DRAMs, you need 16 of the same type. There are 3 (or so) links to move, to chenge the supply from 12V to 5V, connect tue extra addres line, etc. And if you change the links and fit 64K RAMs, you will have a machien that has video problems after the first couple of scrolls. This led me a right merry dance I can tell you. The reson is simple, once you know it (and it's not in any of the manuals. Pin 8 of the DRAMs changes from being a +5V lien to adress lien A7. It's decoupled to gound by 16 (I think) 100nF capacitors for 16K RAMs. If you don't remove these when doign the upgrade, there is a ridiculous amount of delay on the A7 line, so addresses get mangled. Fitting RAM in the socekts on the mainboard has no gotchas AFAIK. Just stuff in 4164s in sets of 8. -tony