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I did desolder the two resistors in line and noticed that the signals go low on the port. But they stay high on the VGC. It's almost something on the soft switches is driving it high and keeping it that way.

Yes! That's exactly what I see. But its so strange because the VGC is known good. And the original VGC I pulled works in a different system. It seems like the EN35 and HDSEL lines originate at the VGC. Unless some stuck address is setting the bits for those to stay high, I have no idea what...

Yes, it’s set to the defaults.

@bigmessowires, I could use your help if you have any updated info on this issue.... This week, all of the sudden my ROM3 IIGS no longer sees my 3.5” drive or the floppyEMU. I thought the drive was bad, but I put it on my IIC plus and it works fine. I read this thread that it's the VGC chip. I...

forgot to mention i did deoxit the simm slots too. no difference

Got a lc575 board for my mystic a few weeks back. I first got it and installed it without knowing you have to do the resistor mod or otherwise mod it to work with the CC. I popped it in and turned it on, it came up fine but within a few seconds of the screen coming on and displaying, the video...

Hi, im having a similar issue. I'd love a copy of your spreadsheet!