Article 171412 of comp.os.vms:
-----BEGIN PGP SIGNED MESSAGE-----

In article <9536441003061997/A03735/HERL45/11B61AAC2300*@MHS>,
 "Charles Hamm (hamm.charles@epamail.epa.gov) 919-541-3017" writes:
[snip]
> All I know is that all RGB's aren't the same. We tried swapping the VRC-16's
> on a VLC and a VXT, and neither worked on the other machine. The VRC's do
> have different suffixes, so something would appear to be different.
> 
> Someone awhile back suggested using a Samsung 17GLsi (combination VGA and
> RGB) monitor for the VGA application. Is this a possibility?

It was probably me waffling on about the Samsung 17GLsi. It has worked with
every machine I've tried it with (4 or 5 types of VAXstation and a similar
number of Alphas). Why not persuade a dealer to let you try one on a sale or
return basis ? I can only tell you that I've been pleased with mine. I've also
seen the Liyama 17" multi-synch monitor working on VMS Alphas, and the image
quality looks good.

The sort of information you need to check is what horizontal and vertical
refresh frequencies you need, and whether the monitor supports BNC input with
sync on green. For example, some while ago Matt Thomas <thomas@lkg.dec.com>
from DEC posted a table giving typical values for Alphas and VAXen:

|They will use one of these three values:
|
|Resolution      Vertical (hz)   Horiz. (Khz)    Bandwidth (Mhz)
|
|"1024x864"         72.03           57.38            74.30
|"1280x1024"        66.51           70.70           119.84
|"1280x1024"        72.56           77.17           130.8
|
|And sync is always on green.

A typical VLC with a 1280x1024 resolution will have 77KHz horizontal
refresh rate, 72Hz vertical refresh rate and a 130MHz pixel clock rate.
Most decent muliti-synch monitors work all this out whe  you plug them in.

The Monitor Database on the following page is useful for getting the spec of
various monitors:

            http://www.nashville.net/~griffin/

Hope this helps.
                       - Phil Ottewell

-----BEGIN PGP SIGNATURE-----
Version: 2.6.3i
Charset: noconv

iQCVAwUBM5ddgAFrKHWv1IPxAQEPmQQAgOyACE/2Rl5i0a9KGQtMg4+rQXlcVhxO
XOy10LXp/YWu7xHRAlummK/PqnU7E57JDoQggBVW4BJyTz4glPyFrGsJrG4bfS+P
vgpobQmXwTyWyjX2RifSMtL+CynpPsuWXO7wf5QfNqa8T0uDOorZ8yVwHr0QAVXL
3gKQ551QDBA=
=T0Mu
-----END PGP SIGNATURE-----