9 Dec
1999
9 Dec
'99
4:43 p.m.
If you have a cable which separates the 3 video colors and their returns
where
from the DE-15 and also brings up the two sync signals
you're on your way,
but you need to put an adapter in the cable in order to
allow you to invert
sync polarity in case the video board requires it. If you have 5 BNC's,
that normally means you don't need the 500-ohm resistor to green video from
the comp sync pin on your video board's application connector. That just
imposes sync on green, which won't help with your 5-bnc monitor. The key
question is whether or not the video card can produce a sync combination
palatable to your monitor. I believe the A2094 uses a 72-Hz vertical rate
to produce 1280x1024. at 72 Hz, that exceeds the capabilities of most video
DACs as normally found on PC video cards. Knowing that, I'd not expect to
find a card for just a few dollars (few meaning <<1k) which is up to the
task. Most current generation video boards interlace the 1280x1024 at 83 Hz
in order to stay within the DAC's capabilities.
Dick
-----Original Message-----
From: Lawrence LeMay <lemay(a)cs.umn.edu>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Thursday, December 09, 1999 10:58 PM
Subject: Re: Hewlett Packard A2094 Monitor (Standard RGB ?)
> I have found a manufacturer that seems to have an
adaptor to allow me to
use
my HP A2094
monitor with my standard PC for only $30.00.
Could this actually work ?
It will help you just as much as wrapping a rubber band around the
video cable. Sure, the rubber band wont do a damn thing for you, but
it will cost a lot less than $30.00 ;)
I am not a monitor expert so could someone tell
me if this could work by
adding composite sync on pin 13, and on green pin 2 ?
Looks to me that It would only be MONO if this is done ?
Here is the information from their site:
PC Sync Adapter (Cost $30.00)
You dont need a sync adaptor. Your monitor has 5 BNC connectors, and can
thus accept separate sync. This is a GOOD thing. Especially since your
video card generates separate sync.
Now, you say that some source mentions that the monitor is not VGA
compatible. Most likely, this is because the monitor doesnt support
a 640X480 @ 60Hz mode. When IBM compatible computers boot up, they always
use this video mode, and later in the boot sequence they switch to
whatever mode you specify.
SO. IF this monitor is going to work at all, what you need is a video
cable with 5 BNC connectors on one end, and a HD15 connector on the
other. If the monitor doesnt support 640x480, then you would have to use
another monitor to set windows to the correct resolution and refresh
rate, and then switch monitors. Thereafter, when the machine is booted up,
the monitor would not sync up until the boot sequence reached the point it changes to the correct resolution and sync rate. Of
course, if something
goes wrong, you wont have a clue whats wrong until you switch monitors...
Dont pay more than $15 for the video cable, and make sure it comes with
a toroid of some sort. As long as you're sure your IBM video card can be
set
to that maximum resolution and refresh rate that the
monitor can handle,
I would say this has an excellent chance of working.
-Lawrence (using a good HP A4032A 17" monitor some company discarded) LeMay