Looking to build an external ZX81 or Timex 1000 keyboard? Then I have just the 1982(ish) document to help get you started.
As part of a recent eBay acquisition of several ZX81-related books, I received an unexpected bonus. Included in the parcel was an excellent period document from the company Mule Electronics, outlining how to build and connect an external keyboard for the Timex 1000/ZX81. As far as I can tell, the document originated in the USA, although unfortunately there is no indication of the company's address or the exact date it was produced.
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| Converting Your Sinclair Keyboard – loose-leaf pages from a great little guide. |
The document Converting Your Sinclair Keyboard contains a wealth of information that is still useful today, explaining exactly how the ZX81's keyboard works and what to consider when building your own external keyboard. It's well worth reading alongside the other keyboard modification documents available.
The document was simply too good not to share, so I've uploaded the complete guide to the
Internet Archive.
If you're planning an external keyboard project, it's definitely worth downloading a copy.
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