17 Nov
2009
17 Nov
'09
3:33 p.m.
I would like to build a RGB-VGA converter but I don't know how to design one. If you
have a circuit diagram, I would like to obtain it.
I have an old RS6000 320H computer which has RGB 3 BNC with sync on green. It also says
"separate". It also says that 1280 * 1048(something like that). The original
monitor (IBM 6091-19)has H freq =63.35kHz (something like that), V = 60 Hz.
Could you help me with the circuit?
Thanks
Chungduck Ko
18 Nov
18 Nov
8:23 a.m.
ck wrote:
I would like to build a RGB-VGA converter but I
don't know how to design one. If you have a circuit diagram, I would like to obtain
it.
I have an old RS6000 320H computer which has RGB 3 BNC with sync on green. It also says
"separate". It also says that 1280 * 1048(something like that). The original
monitor (IBM 6091-19)has H freq =63.35kHz (something like that), V = 60 Hz.
Could you help me with the circuit?
Why build? You can get one for about $10.
Peace... Sridhar
9:28 a.m.
On Wed, 18 Nov 2009, Sridhar Ayengar wrote:
ck wrote:
True, and it's not even a converter, just a simple adapter. The so-called
VGA connector (i.e. DE15) already provides RGB signals, so no need to
convert anything.
Christian
I would like to build a RGB-VGA converter but I
don't know how to design
one. If you have a circuit diagram, I would like to obtain it.
I have an old RS6000 320H computer which has RGB 3 BNC with sync on green.
Why build? You can get one for about $10.
9:31 a.m.
Christian Corti wrote:
True, and it's not even a converter, just a simple adapter. The
so-called VGA connector (i.e. DE15) already provides RGB signals, so no
need to convert anything.
He's going the other way around. Trying to hook a VGA monitor to an
RS/6000.
Peace... Sridhar
I would like to build a RGB-VGA converter but I
don't know how to
design one. If you have a circuit diagram, I would like to obtain it.
I have an old RS6000 320H computer which has RGB 3 BNC with sync on
green.
Why build? You can get one for about $10.
5:24 p.m.
On Wed, 18 Nov 2009, Sridhar Ayengar wrote:
He's going the other way around. Trying to hook a
VGA monitor to an
RS/6000.
That's what I had in mind. But a "VGA" monitor is still an analog RGB
device with RGB signals (usually) on a DE15 connector, and doesn't need a
converter.
Christian
19 Nov
19 Nov
3:03 a.m.
Christian Corti wrote:
On Wed, 18 Nov 2009, Sridhar Ayengar wrote:
But the signals go *to* the monitor. Not *from* it. The device he's
using (IBM 7012-32H) doesn't provide RGBHV. It provides SOG.
Peace... Sridhar
He's going the other way around. Trying to
hook a VGA monitor to an
RS/6000.
That's what I had in mind. But a "VGA" monitor is still an analog RGB
device with RGB signals (usually) on a DE15 connector, and doesn't need
a converter.
10:31 a.m.
On Wed, 18 Nov 2009, Sridhar Ayengar wrote:
But the signals go *to* the monitor. Not *from* it.
The device he's using
(IBM 7012-32H) doesn't provide RGBHV. It provides SOG.
Of course, what are you trying to tell me? Many monitors support SOG, so
put the red channel from the 3W3 to the red channel on the DE15, and the
same goes for the green and blue channels. That's it (along with ground,
of course). BTW good monitors have BNC inputs, so just use a 3W3->BNC
cable, et voil? (I did this with my Turbochannel DECstations and Alphas).
Christian
18 Nov
18 Nov
8:09 p.m.
He's going the other way around. Trying to hook a
VGA monitor to an
RS/6000.
What signals do you get from the RS/6000? I am going to guess at RGB on
BNC sockets. with sync-on-green (this actually makes the green signal
look like a composite monochrome video signal).
Firsly, you need a monitor which will work at the right scan rates.
Converting scan rates is a non-tricial project!. I have no idea what rats
an RS/6000 uses, though.
I believe some VGA monitors can handle sync-on-green, in which case all
you need is a cable adapter. Othes need separate TTL level sync signals.
You then need to build a sync separator, which you feed from the green
video signal. I've always found the LM1881 chip (National Semiconductor
originally, I think) or the improved versions from companies like Elantec
work well here -- I am sure data sheets are on the web somewhere.
-tony
10:06 a.m.
On Wed, 18 Nov 2009 02:03:11 am ck wrote:
I would like to build a RGB-VGA converter but I
don't know how to design
one. If you have a circuit diagram, I would like to obtain it.
I have an old RS6000 320H computer which has RGB 3 BNC with sync on green.
It also says "separate". It also says that 1280 * 1048(something like
that). The original monitor (IBM 6091-19)has H freq =63.35kHz (something
like that), V = 60 Hz.
Could you help me with the circuit?
Thanks
Chungduck Ko
I reckon if you got an LM1881 sync separator and wired the Green output to the
composite input, it'd give you horizontal and vertical sync that can be put
into a VGA monitor.
A quick Google gives this website, which details it...
http://www.tkk.fi/Misc/Electronics/faq/vga2rgb/vgamonitor.html
Cheers,
Alexis.
10:08 a.m.
Alexis wrote:
On Wed, 18 Nov 2009 02:03:11 am ck wrote:
Might be easier to just use a monitor that takes SOG. There were quite
a few made.
Peace... Sridhar
I would like to build a RGB-VGA converter but I
don't know how to design
one. If you have a circuit diagram, I would like to obtain it.
I have an old RS6000 320H computer which has RGB 3 BNC with sync on green.
It also says "separate". It also says that 1280 * 1048(something like
that). The original monitor (IBM 6091-19)has H freq =63.35kHz (something
like that), V = 60 Hz.
Could you help me with the circuit?
Thanks
Chungduck Ko
I reckon if you got an LM1881 sync separator and wired the Green output to the
composite input, it'd give you horizontal and vertical sync that can be put
into a VGA monitor. 
10:25 p.m.
On Wed, 18 Nov 2009 05:08:12 -0500
Sridhar Ayengar <ploopster at gmail.com> wrote:
Might be easier to just use a monitor that takes SOG.
There were
quite a few made.
Seconded. E.g. every Sony Trinitron monitor (Sony branded and
the
various OEM versions like IBM, SGI or Sun) I came acros was able to
sync to anything: Separate sync, composite sync, sync on green. The
OP said somthing about 63.35 kHz / 60 Hz. That is not critical. Every
"multisync" tube >= 17" should be able to sync to that.
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
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