Sinclair ZX80 / ZX81 / Z88 Forums

I've been breadboarding a project to try and replace the Timex 1000 internal ROM with an external EPROM (by way of the edge connector). Has anyone been able to successfully accomplish this? I'm just using a 27c128 and driving the /OE and /CE with A14 (LOW) AND /MREQ (LOW). /ROMCS is also pulled high...

I'm still working on some minor revisions, but once that's all done I will be releasing the Gerber files along with design files to the public so anyone can produce it and/or modify it to their liking. At some point I'll probably sell them too as the minimum order is 5 when getting them manufacture...

Beautiful!! I like the transparent keycaps with the black labels on it. How did you print and attached them? Thanks, this is the set of stickers I used for the keycaps. https://www.4keyboard.com/commodore-keyboard-stickers/647-3006-sinclair-zx-spectrum-non-transparent-keyboard-stickers.html#/21-key...

I've been getting into the TS 1000 over the past year and one the things that I absolutely wanted was a mechanical keyboard for the system. Looking around I couldn't really find any available PCBs for building such a keyboard (ZX-Key is nice but isn't available). Thus, I figured I'd work out a desig...

I've been trying to get the ASZMIC rom working on a TS1000 but so far all the dumps I've seen are targeted at 50hz. Based on what the original author said here https://forum.tlienhard.com/TS1000/www.ts1000.us/cgi-bin/yabb/YaBB.pl-board=ROM;action=display;num=1117401388.htm , they definitely had cust...