IIgs to arcade monitor experiment

["Ferdinan Meyer-hermann" <ferdinan.meyer-hermann@a2central.com.remove-128u-this>]

  To: MdntTrain
  Re: IIgs to arcade monitor experiment
  By: MdntTrain to comp.sys.apple2 on Tue Apr 22 2008 10:13 am

 > Video: these numbers don't look well matched, and I'm not sure what to
 > do about it yet.    If I connect the IIgs RGB directly to a higher
 > impedance than 75, the signal voltages are higher.. not as high as
 > 4V... but maybe enough for sufficient contrast.   However, does the
 > IIgs video signal get screwed up somehow if I don't load it with 75
 > ohms?
You should have about 2 Vpp video. It might be enough, especially if the
monitor can be tweaked a little to get a higher contrast out of it.
And if the GS hase a "current source" output configuration, it might even be
possible to remove the GS' internal termination resistors to get more signal
out of it. The line should then be terminated with - say - 150 Ohms.
If the video is screwed up, It may be that the GS contains no termination
resistors. Then what I've said above aplies too.
But keep the non-terminated wires short!
The sync can propably just be connected, If there are no polarity concerns.
Just try it, it just won't work if the polarity is wrong.

Ferdinand

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