Help with Sun video
pete at dunnington.plus.com
Wed Oct 29 18:46:09 CDT 2008
On 29/10/2008 16:28, Tony Duell wrote:
>> I'm starting to suspect that the Belkin converter box may be
>> defective, in that it appears sync _is_ getting through while video
>> is not. I can't think of any other reason why the monitor comes
>> out of standby and yet displays a black screen. Will get a scope
>> on it soonish and see what's coming out.
> This is an LCD monitor, isn't it? I have little experience of those,
> but I have seen a video projector that would detect a signal will
> incorrect scan rates, but not attempt to display it. Maybe your
> monitor is similar.
A lot of LCD monitors do that -- including the two in front of me now.
> It may be (as your other message implied) that the adapter somehow
> gets the workstation to output some scan rate that uour monitor can't
Sun (and SGI) 13W3 connector use some of the pins not otherwise reserved
for sync as monitor sense pins -- and the permutation of which are tied
high or low tells some video adapters what resolutions (and hence scan
rates, sometimes) to use. So it's possible. I think it's unlikely,
though, because most adapters I've seen don't connect those pins in any
exciting way, and anyway, Suns don't usually change resolution except
during the boot process.
All I can say is that I've never had much luck with Belkin KVMs on Suns
and SGIs, or even PCs in some cases, and tend to stick to others that I
know are less picky. The best ones I found are cheap Newlink ones. I
have one here working happily with a Sun, an SGI, a PC, an Apple Mac, an
Acorn Archimedes, and a BBC micro (actually it's a 4-way KVM and the SGI
and Mac are not usually connected to it), without a PS/2 keyboard in
sight. Sadly they don't make that model any more :-(
Pete Peter Turnbull
University of York
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