Sinclair ZX80 / ZX81 / Z88 Forums

Yes.

For testing without any expansions, depending on the H/N ROM selection link positions, you can you just put a 27128 EPROM on the ROM socket.

However to do it properly so that there are no problems, see this web page

Mark

Given there are some spare unused sections of the chips, RTS, CTS could also be implemented very easily

Mark

Serial input is possible without too much difficulty, as if needed, a connection can be made to the ULA pin. it is also possible to borrow the ULA UK/USA detection input. Serial output is a bit more tricky, as the ZX81 borrows the video output pin on the ULA to produce the tape (Mic) audio output. T...

Oh, nearly forgot. A UK TV station (Channel 4 IIRC) and a UK Electronics magazine used a ZX81 as the intelligent controller for a floor robot. Yes, it was for Channel 4 and the magazine was "Electronics - The Maplin Magazine" . Screenshot_20240531-160615.png Here's a link to a pdf of the relevant c...

Oh, nearly forgot. A UK TV station (Channel 4 IIRC) and a UK Electronics magazine used a ZX81 as the intelligent controller for a floor robot.

I’ll see if I can find a photo.

Mark

Some of my Zeddies came from a training collage. Unlikely they were only used for games.

Mark

The photo that spinner72 was trying to post is this . Or use the provided BBcode: [url=https://ibb.co/C28XGf4][img]https://i.ibb.co/Sry1CzH/Data2000.jpg[/img][/url] Like this: https://i.ibb.co/Sry1CzH/Data2000.jpg As this is a web page and not just a picture (in a format that the forum software reco...

Hello and welcome to our forum RS232!



I hope you enjoy this forum

Although I notice you actually joined some time ago

And thank you for contributing

Mark

No and yes. The keyboard matrix is the same, but the order of the signals on the membrane tails is different. Plus the location on the boards for the connectors for the tails is different. So if you use separate connectors and add your own wiring so you can change the order of the signals, yes. Mark

U1 (µA78S40), Q1 (D432C1), CR1 (1N5821), the inductor L2 and associated components form a buck converter (step-down DC-to-DC converter) which decreases and regulates the output voltage to a set amount. It has the limitation that often a fault with it will result in nearly the full input voltage bein...