I did this once with a single-frequency HP monitor off
of an Apollo. I used a TTL 7404 and a TTL 7408 to
combine the sync's coming off of the VGA card. Because
I wasn't sure how the polarity would work, the 7404's
and a couple of DPDT switches inverted (or not) the
sync signals to get them to work. The VGA pinout for
Hsync, Vsync, and RGB on a VGA is very standard, and
available anywhere. If your monitors are truly
multisync, you should be OK. If they are single-sync
or "bi" sync, the polarity of the monitor determining
which freq setting to use, getting the sync can be a
trial, requiring some goofing around with the PC SVGA
driver. Having a "normal" multisync monitor is
invaluable during the debugging process. As it was
because I was using a definitely fixed-sync monitor I
couldn't see what I was doing until I was in Windows.
--- Geoff Reed <geoffr_at_zipcon.net> wrote:
> I have some SuperMAC 21" multi-sync monitors...
> unfortunately they are 13w3
> monitors, I have found I can get VGA-13w3 cables
> fairly inexpensively,
> however :( these monitors are expecting Composite
> sync or sync on green.
> does anyone have an idea how I can make an adaptor
> to do the sync on green
> or the composite sync? I've never messed with that
> sort of thing before
>
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Received on Mon Jun 03 2002 - 21:07:58 BST