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Super VGA to 1 BNC monitor cable

By xanthor ·
I have an old SuperMac STD9761AV (Platinum 21 Two-Page GS) monitor. I found the following info on the internet:
IMPUT SYGNAL
Video Signal: analog
H Frequency: 60.34/68.68 Khz
V Frequency: 75Hz
Sync Signal: green
VIDEO BANDWIDTH: 80Mhz
INPUT CONNECTOR: 1BNC
MAXIMUM RESOLUTION:
1152x870; 1024x768
I have a Matrox Millenium G200 video card and I would like to use that monitor too.
I bought: 1 bnc connector, 1 VGA connector (15pins) and a coaxial cable. How shall I connect those two connectors? The info says that the sync signal is the green, shall I connect the green pin to the middle pin on the bnc? And what is the pin for the green on my video card? Any suggestion would be really appreciated. Thank you in advice.
Xanthor

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Super VGA to 1 BNC monitor cable

by icp11486 In reply to Super VGA to 1 BNC monito ...

I Belive You Want 2 Montiors Connected To Your Computer.Ok you might be a able to find one at your nearst radio shack if not you can get them on www.ebay.com-auction site.but for 2 montior adapters if your willing to spend like 50 dollars you shouldget it.but if it was me i wouldnt do it

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Super VGA to 1 BNC monitor cable

by xanthor In reply to Super VGA to 1 BNC monito ...

And no, I have 2 computers each one has its own Matrox G200 video card. I would like to use this greyscale monitor as the monitor for the second computer I built from spare pieces. So I need to make a cable that with a BNC plug for the monitor and anormal VGA connector at the other end.

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Super VGA to 1 BNC monitor cable

by richard_barsby In reply to Super VGA to 1 BNC monito ...

Hi Your problem for the BNC monitor is that it use's composite video ie the sync signals and the video are all on one cable, on the G200 the videos are on 3 different pins,

Red pin 1
Green pin 2
Blue pin 3

and the syncs are

Horizontal sync pin 13
Vertical sync pin 14

for ground you could use any of pins 6,7,8,10

your problem is that you have to combine all of these to get composite video which is not straight forward as you cannot just join all of them together and also the syncs have to be negative going and the whole lot has to be in the ratio of 0.3v of sync and 0.7 volts of video all into an impeadance of 75 Ohms. secondly the monitor would only lock when the pc was running windows at 1152x 864 @ 75Hz refresh therefore if the pc was used in any other mode ie games changing modes, also you could not see why the pc failed to boot without connecting another monitor.

Best of luck

R.K.Barsby

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Super VGA to 1 BNC monitor cable

by xanthor In reply to Super VGA to 1 BNC monito ...

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Super VGA to 1 BNC monitor cable

by xanthor In reply to Super VGA to 1 BNC monito ...

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