http://velesoft.speccy.cz/zx/zx-vga/index.html
old photos:
https://picasaweb.google.com/106583848211842323255/ScanDoublerSinclairZXSpectrum128k2#
Hi. This is new version of RGBtoVGA convertor. Author of this hardware is David
Luftner and design it specially for 8 bit computer SHARP. Convertor need small
patch for connect to ZX Spectrum 128/+2 computers. I redesign PCB for
possibility connect to SAM COUPE computer and show up to 128 colors on VGA
monitor (use 2x RED, 2x GREEN, 2x BLUE and 1x complette BRIGHT/intensity).
Actually exist firmware for ZX Spectrum 128/ grey +2/+2A and +3. Firmware for
SAM COUPE can be later...
VELESOFT