Indeed, but Ruptor doesn't describe the latest display - only that the digits of Minerva's RAM test are visible.tofro wrote: a failed EPROM seems relatively unlikely. Any lines stuck on the data bus would most probably affect the screen display.
I've had such a semi legible display before - enough to read the test results, but with nasty vertical patterns mixed-in - in that case, I discovered I had fudged my repair soldering, resulting in the (EP)ROM being enabled at times when it shouldn't have But, as you say, probably less likely than the other possibilities discussed.
Ruptor, can you capture a short video of the boot-up sequence and post it here for review? We can eliminate a few of the options with a clear video or image...