Dexter wrote: > Hi all, > > I've been sat like a hawk on Ebay waiting for a QL to come up for auction. > I recall the US QLs had a different ROM version and PSU, but are their any > other differences?
US TVs use NTSC (Never Twice Same Color; with 525 lines, Horiz Freq 15.734kHZ) whereas UK TVs use PAL (with 625 lines, Horiz Freq 15.625kHz) (checkout http://www.bnoack.com - a mine of tech data), so the TV output (modulator) MUST be different. Assuming US build QLs had a similar list of screen outputs (TV, Colour monitor, B/W [monocrome] monitor, RGB), then a UK QL's TV & Colour [PAL] monitor will be unusable. I think that ULA ZX8301 generates the 50Hz (vertical sync) interrupt (along with the screen display) and the system (CPU) clock, so I suspect there may be a different US version <hastily rushes back to shallow end of pool :-)>. Hope I don't sound too much of a killjoy; are there any hardware gurus who can confirm/deny these suspicions?
