Just learned something… ClockSignal is apparently non-NTSC (PAL) oriented. I was using the US version of TOS 1.0 and, while Low Resolution ran fine, Medium Resolution lost vsync and rolled incessantly! I decided to try the UK version of TOS 1.0 and Medium Resolution runs fine. So, thankfully, its not an emulator glitch. However, I’m wondering how to convert ClockSignal to running in NTSC mode, so I can run the version of TOS my Atari 1040ST ran when I owned one back in the 80’s. Maybe it’s just a video thing or does it go deeper than that? How much difference is there between PAL and NTSC-based home computers?
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