On Tue, Jan 24, 2023 at 7:02 PM Adrian Godwin <[email protected]> wrote: > > On Tue, Jan 24, 2023 at 6:46 PM Tony Duell <[email protected]> wrote: >> >> >> >> >> 1) There is a 5 pin DIN socket for connecting an external video >> >> monitor. The signals seem to be TTL-level separate syncs at European >> >> TV rates (15625Hz horizontal, 50Hz vertical) and separate (not >> >> composite) 4-level analogue video. >> >> I know it well, but it is unlikely to be the monitor I am looking for here : >> >> It's colour (and the P2000C is clearly a monochrome output).While that >> it no real barrier, I doubt Philips would have wasted a colour CRT in >> that way >> > I missed that. So it was pinned for colour but only used mono ?
The P2000C is a monochome system. The built-in monitor is a green screen (P31 phosphor) 9" CRT. The terminal board can output 4 intensity levels, either for things like highlighted text or in grpahics mode (there's 256*252 in 4 levels or 512*252 in 2 levels). The video output socket is essentially the same signals as go to the internal monitor, although separately buffered. There re 5 pins on the video socket. They are (in some order) Ground Horizonal Sync Vertical Sync Analogue Video and, I think, dot clock. No colour at all. > There was another Philips monitor in the same or similar case. I've seen it > in both Green and Amber phosphors. This was also used on the Beeb when colour > was too expensive. I can't remember the number now though.That was almost > certainly composite though - but it was such a common monitor it's quite > possible there was a separate-sync version. My thought is that having provided this rather unusual video output, they would have produced a monitor for it. But while I can find minimal details (like it was a 12" CRT), I can't find a model number mentioned anywhere. Nor any web page that shows it. >> >> >> >> Is it 12"? Something is telling me it's a 14" CRT but I am not gong to >> dig mine out to check. The service manual implies it is over 12" >> diagonal. >> > > You're right. Mine has 13" visible so probably a 14" tube. And although the > mono might have been smaller, that case shape is so embedded in my memory > that I think they must have been 14" too - a 12" version would have looked > amusingly miniaturised. The CRT is an M34EAQ10X according to the CM8833 service manual. The 'M' indicates a colour screen and he '34' is the diagonal in cm I think. So about 13.3" To be honest I find the 12" monitor for the P2000C somewhat odd. It's not a major size increase over the intenral 9" thing. I would have thought a much larger monitor, e.g. to show to a group, would have been more use. -tony
