31 Aug
2011
31 Aug
'11
2:10 p.m.
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 as 4
of 5 wires (sync on green maybe) to get it going?
I also have an aging cranky 24" Viewsonic which has BNC inputs, but when
it goes poof, I'd love to have this as someething I can still run with
an LED display.
I know there is a GIGI discussion in the archive somewhere and will look
for it to see if it had a monitor discussion associated with it.
thanks
Jim
31 Aug
31 Aug
2:37 p.m.
On 2011-08-31 15:10, jim s 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 as 4
of 5 wires (sync on green maybe) to get it going?
probably ;-)
I also have an aging cranky 24" Viewsonic which
has BNC inputs, but when
it goes poof, I'd love to have this as someething I can still run with
an LED display.
If you're saying 24", it probably has 31 kHz as lowest HFreq, so it
won't work.
Otherwise, most Viewsonics have Sync-O-Green.
Cheers
1 Sep
1 Sep
1:15 p.m.
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 as 4
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 (RS170)
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 PSU
cicruit (in fact driven by the horizontal oscillator after startup) and
the thick-film hybrid module cotnainign he vertical defleciton system all
pint to this.
You say toyr terminal has 4 BNCs. Are these labelled in any way? It's not
unheard-of for DEC to have RGB (sync on green) on 3 BNC connector and a
separate monochrome composite video siganl on another connctor.
-tony
3:59 p.m.
On 09/01/2011 04:15 PM, Tony Duell wrote:
The monitor that was used with that was the BARCO which predates the
VR241
by many years.
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 as 4
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 (RS170)
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 PSU
cicruit (in fact driven by the horizontal oscillator after startup) and
the thick-film hybrid module cotnainign he vertical defleciton system all
pint to this. You say toyr terminal has 4 BNCs. Are these labelled
in any way? It's not
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).
Allison
5:37 p.m.
On 09/01/2011 04:15 PM, Tony Duell wrote:
The monitor that was used with that was the BARCO which predates the
VR241
by many years.
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
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
as 4
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
(RS170)
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
PSU
cicruit (in fact driven by the horizontal oscillator after startup) and
the thick-film hybrid module cotnainign he vertical defleciton system
all
pint to this. You say toyr terminal has 4 BNCs. Are these
labelled in any way? It's
not
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).
Allison 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.
Jim
5 Sep
5 Sep
2:53 p.m.
On 02/09/11 01:37, jim s wrote:
I recently acquired a DEC GIGI and having read the vintage computer
forum post here:
http://www.vintage-computer.com/vcforum/showthread.php?20424-DEC-GIGI-and-m…
I was clued up to what might happen when it was turned on - after about
5 mins the magic smoke escaped from the 0.22uf metal film power supply
smoothing capacitor.
Apart from that it's in fine condition, except for some case yellowing.
All keys are present and it looks to have been kept inside all its life.
I wired up the 3 BNC RGB connections to the RGB connections on a 5 BNC
to VGA adapter and got a reasonable picture on my Iiyama 18.1" TFT flat
panel.
Regards, Mark.
On 09/01/2011
04:15 PM, Tony Duell wrote:
The monitor that was used with that was the BARCO which predates the
VR241
by many years.
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.
Jim 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
as 4
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
(RS170)
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 PSU
cicruit (in fact driven by the horizontal oscillator after startup) and
the thick-film hybrid module cotnainign he vertical defleciton
system all
pint to this. You say toyr terminal has 4 BNCs. Are these
labelled in any way?
It's not
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).
Allison
6 Sep
6 Sep
10:46 a.m.
I was clued up to what might happen when it was turned
on - after about
5 mins the magic smoke escaped from the 0.22uf metal film power supply
smoothing capacitor.
0.22uF is not a smoothing capacitor (at least not for any sensible PSU
frequency :-)). Most likely it's part of a the mains filter circuit. If
so, you can run without it for the moment, but it's best to replace it,
My guess is thati's across the live nad neutral of the mains (given its
value), so a class X capacitor would be fine.
Often when coe capacitor in amains filter fails, the others aren't far
behind. Although I dislike 'shotgun debugging', I normally replace the
lot. Anything betwene live and neutral can be replaced by a class X, but
the ones from one side of the mains to earth (ground) should be repalced
with class Y for safety. These are normally much lower in value, arroudn
4700pF.
-tony
4624
days inactive
4630
days old
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