The problem with skipping is knowing which ones to skip. It could also be caused by some other mechanism of course, an unknown unknown.

I've never looked at the suska source actually. Maybe I should learn VHDL.

That effect comes from the ST and shifter being out of sync with each other. The shifter only gets reset at boot time, when the internal registers are cleared, and after that if it receives an extra LOAD it gets out of sync like this and stays that way until the next reset when it should go back to ...

That's fancy, I just use my fingers

Great video - thanks for going to the trouble to post it. Those vertical bars are definitely not data line issues - that's the so-called "every other 16 pixels background" problem which manifests as a blank bar of 16 pixels every 80 pixels in mono. It's purely to do with the timing of when data is l...

Another question (which is not as easily answered): if you had an original shifter installed, would it still fail the blitter short test?

That's very interesting and strange, because the blitter doesn't interact with the shifter. And surely nothing here can tell where the mouse pointer is... right!? Unless moving the mouse to a certain spot causes the ST or its associated wires to move. Question: does it still happen when you use the ...

Adding it to EmuTOS should be relatively straightforward, without any hardware changes. ...I say "relatively" by comparison with real TOS.

I think a modified TOS would be necessary because I'm sure TOS would be checking the mono-detect pin immediately after boot to determine which video parameters it should use. It'd have to be modified to figure it out some other way. I've simply wired a physical switch into my machine that grounds th...

Woohoo! Thanks man. I love it when a plan comes together!

Very possibly!