Dear admin colleagues,
I received additional replies regarding my questions on (whether and)
how to operate a VRT19-HA monitor at a TGA 8-plane graphics card:
Richard Loken mailed me some data (which I abridge here):
Here is what the manual says about the VRT19-HA:
1280 X 1024 resolution (95 dots per inch)
72 Hz to 66 Hz Auto-Selectable Refresh rate
Video input: separate RGB inputs 75 ohm imdedance 0.714V p-p
positive
with 0.286 negative sync added to the Green signal.
Richard Bond recommended to search at "google.com" or
"monitorworld.com"
(or other sites) for technical data.
I was not able to find "VRT19-HA" there, but the label also gives a
Sony type: "GDM 1961", and that was listed - with 1280 * 1024
resolution.
So it seems the "1152*870" value (which I got first, see first summary)
is too conservative, or maybe intended for 1 MB cards.
("VRT19-HA" is given as that Sony monitor's tube model!)
Simon Greaves gave this tip:
There used to be a company making PC video cards that worked with
fixed
frequency monitors etc - stuff you'd typically see on older UNIX
workstations. Either the company name or the product name was 'photon
torpedo' so if they're still around a web search should find them.
The cards came with their own drivers, and once installed worked just
like
a normal SVGA card, even during booting. I used one with a VRT19 on
an NT
PC running HP's OpenView network monitor.
There was an additional message which I accidentally deleted,
it described the monitor cable (sub-D form with only three coax pins
at the card end, three BNC plugs at the monitor end) which the author
had encountered at a Digital-5000 machine and still got the monitor
to work at other cards.
As my DEC-3000 machine had the same cable, this was quite interesting,
so it seems possible to get that monitor to work at other cards as
well provided the refresh rate can be set between 72 Hz and 66 Hz
(see Richard Loken's data above).
This mail also recommended using the boot messages for the TGA card's
memory - the author has one with 4 MB. Well, this my machine runs
AXP-Linux (SuSE 6.1), so the message details differ, but it says
"1 MB" in my case - probably "TGA 8-plane" is not a unique ID.
Let me repeat my sincere thanks to all of you, I appreciate all
your input.
Nonetheless, for me this idea has died - the monitor data
(1280 * 1024, 72 Hz) are not good enough (by today's standards)
that I would go for the trouble of finding special cabling and
do the experiment. I will stick with the current 17" monitor at
this 1 MB card and probably later upgrade both card and monitor
to "current standards".
Regards,
Joerg Bruehe
--
Joerg Bruehe, SQL Datenbanksysteme GmbH, Berlin, Germany
(speaking only for himself)
mailto: joerg_at_sql.de
Received on Mon Aug 14 2000 - 09:17:41 NZST