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ZX Resource Centre - Sinclair ZX Interface 2, ZX Spectrum 128 and ZX80
Various ZX80/81/Spectrum mods, including RGB output. There's lots of interesting information here but the wacky navigational structure makes it hard to find...
to electronics retrocomputing rgb sinclair spectrum video zx80 zx81 ...
on 05 March 2015
Grant's hardware homepage
DIY ZX80, ZX81, Jupiter Ace, UK101, etc.
to ace electronics jupiter retrocomputing sinclair uk101 zx80 zx81 ...
on 31 October 2012
by Adam Sampson.