Well, it took four years but I finally found time to update this page. This section entitled hacks now includes links to some MIDI and guitar effect schematics. What's new? Check out the SynthAxe page. No doubt more will be added Real Soon Now.
A number of people have emailed me asking questions that start 'Are you the John Hollis who wrote...' so, just for the record...
Once upon a time there was an innovator named Clive Sinclair. His company sold a kit to make the cheapest computer you could buy. It was called the ZX80. A friend of mine, Nick Lambert, had bought one of these machines and started a company called Quicksilva. He made 3K RAM boards and was writing a version of Defender for the ZX80. I became involved in designing add-on hardware for the ZX80 and it's successor, the ZX81. Nick finished writing Defender and I wrote a version of asteroids for the ZX81. As soon as the ZX Spectrum was released we dropped the hardware products to concentrate on writing games.
As far as I can remember the sequence of Spectrum releases was:
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Revised and Verified: August 27th, 2001