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David A Stephenson
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ZeaMouse V2, USB Mice for the ZX81 & Spectrum Revisited: Part 2
The ZeaMouse version 2 firmware should take a USB mouse and have it function in a similar fashion to a Commodore 64s 1351 mouse. The 1351 had two modes of operation, an analogue mode and a digital compatibility mode. In digital mode a 1351s analogue movemen...
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I came across a great period document on building DIY keyboards for the ZX81, I've made whole thing avaliable to the rest of the comunity on the Internet Achive.
A DIY ZX81 Keyboard Period Document
A DIY ZX81 Keyboard Period Document
zx81keyboardadventure.com

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A DIY ZX81 Keyboard Period Document
Are Looking to build an external ZX81 or Timex 100 keyboard? Then I have just the 1982(ish) document to get you on your way. As part of a recent Ebay acquisition of some ZX81 related books I received an additional surprise. Included in the parcel was a rath...
A DIY ZX81 Keyboard Period Document
A DIY ZX81 Keyboard Period Document
zx81keyboardadventure.com
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Easy add-on Projects for Spectrum ZX81 & ACE (Redux): Part 3
Now that we have a working Decoder Board from ' Easy Add-on Projects for Spectrum, ZX81 & Ace ', it's time to get down to some projects. There are a couple in the book I've really been wanting to try out,  Project 2: Picture Digitser and Project 7: Light Pe...
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The Second Issue of the retro computing focused 'Paleotronic' magazine has been released. I got the chnace to interview Richard Altwasser and talk ZX Spectrum, a little ZX81 and write a feature article on Spectrum Graphics. Check out the mag at https://paleotronic.com/
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ZeaMouse V2, USB Mice for the ZX81 & Spectrum Revisited: Part 1
A year ago I knocked up the ZeaMouse, a USB mouse interface for the ZXpand and ZX81. ZeaMouse is a USB to digital mouse expansion board built around an Adrunio USB host shield. A year on it seems like a good time to revisit the project and make some improve...
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