3 Apr
2016
3 Apr
'16
9:33 a.m.
I could do with getting hold of a VR241, but these seem to be pretty
unobtainable. So the alternative is to rig up an adapter of some kind to
work with a VGA LCD, which also saves on space. I came across the following:
http://www.vcfed.org/forum/showthread.php?38450-VR241-substitute-for-Rainbow
-VT240-etc, has anyone else tried this with success?
Regards
Rob
3 Apr
3 Apr
11:51 a.m.
I could do with getting hold of a VR241, but these seem to be pretty
unobtainable. So the alternative is to rig up an adapter of some kind to
work with a VGA LCD, which also saves on space. I came across the following:
http://www.vcfed.org/forum/showthread.php?38450-VR241-substitute-for-Rainbow
-VT240-etc, has anyone else tried this with success?
If it's any help, the VR241 is a (US) TV rate monitor with analogue RGB inputs. It
can
be switched between separate composite sync (on a 4th BNC socket) and sync-on-
green, with the Rainbow, Pro 300 series and VT240 it is used in the latter mode. I
would guess the DECmate also uses SOG.
Not that it matters here, but the original VR241 is a Hitachi chassis with features you
might expect from that manufacturer. The deflection circuit is based round a thick-film
hybrid module contain an IC for both oscillators and power transistors for the
vertical output stage. The power supply is driven (when running) from the horizontal
output stage, this means a ridiculously complex startup circuit...
-tony
11:59 a.m.
On 03/04/2016 19:51, "tony duell" <ard at p850ug1.demon.co.uk> wrote:
Also also possibly any help - I used a VR241 monitor on an Amiga 500 for
years with a cable I knocked up out of a VAXstation monitor cable and a
23-pin clamshell which was almost unobtanium in those days, so if you have a
monitor that works with an A500 you stand a chance of getting it working
with other things.
--
Adrian/Witchy
Binary Dinosaurs creator/curator
Www.binarydinosaurs.co.uk - the UK's biggest private home computer
collection?
I could do with getting hold of a VR241, but these seem to be pretty
unobtainable. So the alternative is to rig up an adapter of some kind to
work with a VGA LCD, which also saves on space. I came across the following:
http://www.vcfed.org/forum/showthread.php?38450-VR241-substitute-for-Rainbow
-VT240-etc, has anyone else tried this with success?
If it's any help, the VR241 is a (US) TV rate monitor with analogue RGB
inputs. It can
be switched between separate composite sync (on a 4th BNC socket) and sync-on-
green, with the Rainbow, Pro 300 series and VT240 it is used in the latter
mode. I would guess the DECmate also uses SOG.
12:08 p.m.
Also also possibly any help - I used a VR241 monitor on an Amiga 500 for
years with a cable I knocked up out of a VAXstation monitor cable and a
23-pin clamshell which was almost unobtanium in those days, so if you have a
monitor that works with an A500 you stand a chance of getting it working
with other things.
My guess (and I have not tried it) is that a TV with a SCART socket could
be used in place of the VR241 with a bit of fiddling (maybe a sync separator).
-tony
2:18 p.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of tony
duell
Sent: 03 April 2016 20:08
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Subject: RE: VR241 Substitute
be
Also also possibly any help - I used a VR241 monitor on an Amiga 500
for years with a cable I knocked up out of a VAXstation monitor cable
and a 23-pin clamshell which was almost unobtanium in those days, so
if you have a monitor that works with an A500 you stand a chance of
getting it working with other things.
My guess (and I have not tried it) is that a TV with a SCART socket could used in place of the VR241 with a bit of fiddling
(maybe a sync
separator).
-tony
Well, I don't have an A500, but I do have an LCD monitor that does SOG. So
it sounds like all I need to do is get the DECmate's output through to the
LCD monitor and the keyboard input to the DECmate, is that right?
If so, I have one of those DEC cables that has a keyboard connector on it
and RGB plugs (their proper name is escaping me right now), and a cable that
converts those RGB plugs to a VGA connector. Assuming the computer end of
the cable matches the DECmate's pinout, I may be able to rig up what will
probably look an unsightly mess into something that will work. I will have
to check pinouts, but I will give it a go.
Regards
Rob
3185
days inactive
3185
days old
4 comments
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participants (3)
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ard＠p850ug1.demon.co.uk -
robert.jarratt＠ntlworld.com -
witchy＠binarydinosaurs.co.uk