24 Jan
2023
24 Jan
'23
7:15 p.m.
On Tue, Jan 24, 2023 at 7:02 PM Adrian Godwin <artgodwin(a)gmail.com> wrote:
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
On Tue, Jan 24, 2023 at 6:46 PM Tony Duell <ard.p850ug1(a)gmail.com> wrote:
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.
>
> 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
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.