Phoebus, IIRC I had to invert one of the signals on the video. Now just which one it was?? In 84-5 a new RGB monitor was funtional with this inverted signal. Perhaps one of the fellows over here can elucidate? I think it was vertical sync, but don't bet money on it. I have no documentation and very little memory of it.
Has anyone inverted the signal on one of the video lines here in the US? Dennis N9VRB ICQ #801900 ----- Original Message ----- From: "John Impellizzeri" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, April 17, 2002 6:05 PM Subject: Re: [ql-users] US QL specs... (and problems ;-) > > Am I right to assume that the US QLs do not generate a "proper" (US spec > > that is) Composite video signal? > > I tried GND and where in the manual says PAL (which I assumed would be NTSC > > for the US but since I don't have a US manual I don't know!) but the only > > place I can get the QL to output composite video signal is on the > > Monochrome... Any Ideas? > > From what I remember from investigating this many years ago the US QL's do > output a NTSC composite signal but it is not "proper" and this is why most > monitors will show monochrome. Further adding to the confusion, any manual > I have ever seen for US QL's doesn't show the output as being NTSC, it was > always labeled PAL and since the signal wasn't quite "right" and didn't > display correctly it got assumed that it was a PAL signal even though it is > NTSC (well, almost). If you connect a PAL video signal into a NTSC monitor > you will see a monochrome picture (assuming the monitor can sync to the > slightly different scan rates). > > It's been awhile and I'd have to haul out an old QL and a 'scope to verify > it but I think the composite signal had all the components it was just > output at the wrong levels and most monitors can't tolerate the signal being > that far out of spec. Can you get a color display using a television set > connected to the RF modulator? If so you might have better luck connecting > a composite monitor to the composite input pin on the modulator and > disconnecting the modulator if you don't use it. I seem to recall the > signal was a little closer to "proper" here than it was at the DIN-8 jack on > the back. > > -- > John Impellizzeri > mailto:[EMAIL PROTECTED] > > >
