Sinclair ZX80 / ZX81 / Z88 Forums

I saw an interesting article on Hackaday about Ferranti and the Gem Mill plant https://hackaday.com/2021/09/15/ferrantis-ghost/ . It does mention the ZX81 ULA.

Looking forward to EO v2.0. EO has always been my favorite emulator.

Welcome back Mike! Thank you for all your work on the Eighty One. I enjoy the authenticity of the emulator. It has the look and feel of a real ZX81 right down to the ram pack wobble .

jdfan1000, Thanks for the links! I didn't know there was info on the web about that group. That takes me down memory lane. :D It was ZXLR8 that I used with my Winky Board 2 but I always had troubles getting the volume level right to make it work. jipock or dessony would it be possible to draw up a s...

I had one! In fact when I went to Penn State University one of the members of the Timex Sinclair SIG that met on Campus, I believe was the Centre County Timex Sinclair Group, was G. Russell. It is a device to enhance the tape loading of programs. You could listen in on what was going in and there wa...

I believe marste has a Kickstarter page for Real Chess viewtopic.php?f=4&t=4080&p=41658#p41658

Awesome! Just what I'd need for a new home for my spare ZX81 ROM Chip and one of my Z80 chips

I am planning on doing some experimenting with the Teensy 3.5 controlling the memory using BusRQ, BusACK and the control lines that may falsely trigger the ULA. The Teensy is 5 volt tolerant so inputs are not a concern but the output is 3.3V logic. Most 5V logic chips will trigger a high with a high...

I didn't notice the DB9 connector until I looked at the recent picture. Is that a standard RS232 port?

Can't wait to see how it works! :D . I'm going to start looking into replacement ULAs. I don't want to cannibalize the ZX81s I have to build another one. I know this will be opensource so it'll be up to me to find a pcb fab house and send the gerbers to them.... unless someone makes a run of pcbs an...