On 09/01/2011 04:15 PM, Tony Duell wrote:
I dug my
GIGI out of the pile this weekend, during a visit to my stuff
in Kansas City. I notice it is running out 4 bnc's and recall that the
Dec monitor I had at one time had that sort of feed. Is it as easy
of 5 wires (sync on green maybe) to get it going?
I suspec the original mnonitor
was a DEC VR241. This is a TV rate
colour monitor. The inputs are either RGB + composite sync on 4 BNCs or
RGB (Sync on green) on 3 of the BNCs, selected by a swtich on the back.
FWIW, i am pretty sure this monitor is actually a Hitachi design. The
cicruit (in fact driven by the horizontal oscillator after startup) and
the thick-film hybrid module cotnainign he vertical defleciton system
pint to this.
The monitor that was used with that was the BARCO which predates the
by many years.
You say toyr terminal has 4 BNCs. Are these
labelled in any way? It's
unheard-of for DEC to have RGB (sync on green) on 3 BNC connector and a
separate monochrome composite video siganl on another connctor.
The 4 were Mono, RED Green and blue. For color it was sync on green.
When using the mono it was RS170 composite. (Any monitor capable of
black and white).
At random times, I had acquired some Microvax 38 and cables and a dec
badged sony monitor, probably 17 or 19" I used the BNC inputs (not the
microvax cable) and was able to run the GIGI with it. I got the GIGI
from a scrap dealer in Kansas City, Mo, probably 20
years ago, but no
monitor at that time.
The monitor was perfectly happy to work with the Microvax systems and a
keyboard for some time as well. Sony monitors as OEM devices were
reputed to support striped sync (5 wire) composite sync (4 wire) and
Sync on green (3 wire), which was actually why I wanted that monitor, as
it ran well with a variety of devices.
There were still a number of vendors who managed to invert sync, and
such tricks, and so I was never able to use it for a universal monitor,
but it was my best bench monitor for a long time, along with an OEM
Hitachi, which worked on some RT and Sun systems I had at various times.
thanks to the list for the replies on and off list, I should have no
problem figureing it out.