Re: VMS graphics monitors for dummies
From: Michael Joosten (joost_at_c-lab.de)
Date: 10/02/03
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Date: Thu, 02 Oct 2003 21:20:20 +0200
Phillip Helbig---remove CLOTHES to reply wrote:
>
> There seem to be 3 types of connections on the machines: 3 rather big
> holes with pins inside them,
3W3, just for RGB. There used to be cables with BNC at the other end, so
it is probably easiest to use BNC couplers (or even Cheapernet/ 10Base2
T-plugs for testing) with a common VGA HD15 to 5xBNC cable.
something that looks like a monitor
> connector on a PC (maybe it is the same thing), and a 15-pin connector
> (which looks like the one used for a keyboard/mouse combination thing
> where each plugs into a block on a cord and the cord plugs in to the
> 15-pin connector on the machine).
DB15, like the one at the rear of a VAXStation 3100 or the AUI
connectors? There is page seomwhere that has the pinning, but I think
it's just RGB.
On the monitor side, I have some
> cables with 3 BNC connectors (or one if it's mono) and possibly another
> type with the PC-like connector for the machine on the other end (not
> sure; I don't have it in front of me now).
>
> Can I assume that any combination will work if I have the correct cable?
> (Provided that such a cable exists, i.e. not one specially made just so
> it will fit!)
>
> Will a "standard PC monitor" work with any VAX or ALPHA I might have?
Define 'standard'... I'd say that most 'premium' monitors since 96 or so
should be able to cope with the usual H/V deflection rates, and
hopefully able to use the sync-on-green that the older 3W3 and
DB15-equipped framebuffer/graphics adapters only provide.
>
> Can I damage anything by trying out combinations which won't work?
I tended to say No, but recently it seems that messing around with old
Mac ECL B/W graphic cards seem to have damaged the H and V input of the
second HD15 connector of my office monitor... But that was possibly
through the ECL signals, and I haven't checked in detail so far.
>
> Are there any other differences besides the obvious physical ones?
Signal level and polarity seems to be same in all cases (or might be
compensated by the monitor), there is *only* the question of separate
vs. composite sync vs. sync-on-green. To have support for the latter
might be difficult with a commodity PC monitor, even more with a LCD.
-- Michael Joosten, SBS C-LAB, joost@c-lab.de Fuerstenallee 11, 33094 Paderborn, Germany Phone: +49 5251 606127, Fax: +49 5251 606065 C-LAB is a cooperation of University Paderborn & SIEMENS
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