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Power Mac 7100 stuck with one resolution to choose from

greystash

Well-known member
I've finally got my hands on a Power Mac 7100 with a CPU upgrade but can't screen change resolutions. I have tried two LCD monitors (one with a native resolution of 1024x768), and a ViewSonic CRT with a native resolution of 1600x1200.

I have tried several NUBUS cards and at the moment am sticking with the SuperMac Thunder/24 since the CPU upgrade uses the PDS slot. I have also tried three PDS cards. I'm using a DB15 > VGA adapter but this doesn't seem to be the problem as I've also tried a different one and get the same results.

I've tried changing resolutions within the Monitors control panel, Control Strip, and with SwitchRes - and I am only given one resolution to choose from (1152x870 which seems to be the max the card supports) and can choose all color depths. This is the same with all video cards, monitors and System 7 - System 8.6. I am using the SuperVideo 3.1 drivers, but performance is terrible and it doesn't appear to change anything after installation.

Does anybody know why I would be getting this sort of behavior? I've never experienced this before with any Mac..

 
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