Hello all,
how to connect a HP 9000/300 with RGB BNC video out to a modern LCD
monitor, which has only a D-Sub VGA video connector.
Can I simply use a classic BNC to VGA cable just reverse connected?
Probably not. The HP most likely has 3 BNC sockets. The sync signals are
carried on the green vidoe signal (which is much the smae as a a
monochrome composite signal), whereas VGA uses spearate syncs. Most
adatper cables therefore have 5 BNCs (R,G,B, Hsync and Vsync).
A sync separateor is not a complex project. The LM1881 is the 'classic'
IC for this, there are more recent versiosn of it too. You connected the
input to the green vidoe signal (which also goes to the monitor green
input) and get the sync signals out of said IC which oyu also feed ot the
monitor.
This asusmes the LCD monitor can handle the scan rates used by the HP
unit. Which is by no means certain. Some LCD displays will accpet just
about anything. Others will only accept a very few 'standard' rates
Since from 2015 on there will be no new monitor supporting VGA
singnals anymore what we have to do to connect our old workstations?
I am misisng something here. The fact that VGA monitors are no longer
going to be made does not mean all the ones that exist will suddenly stop
working. For that matter, it doesn't mean that all the origianl
workstation monbitors will stop working. So I intend to keep on using those.
I suspect somebody is going to have to figure out hwo to make flyback
transformers at home (It can't be impossible, as I mentioned before, the
model IC engine crowd make their own igniton coils and vacuum impregnate
them).
-tony