experimenting with uploading video to youtube to lighten the load on the fediverse
fixed the sound on the SM124 SO NOW I CAN WATCH MONOCHROME DEMOS!
here's one that isn't currently emulated properly, it does some overscan tricks, and displays greyscale by drawing during the horizontal blanking interval???
have fun emulating that
doesn't look like a finished production, still pretty glitchy on real hardware 🙃
@Seg Not sure about this specific demo but a lot of the overscan/sync scroll tricks in monochrome relies on the analogue parts of the SM124 to hide the fact that the sync signals are not "clean". That is, they break if you use a modern VGA monitor instead of the SM124.
Indeed difficult to emulate :D
@Seg HA, never heard about an actual overscan demo in monochrome. I knew that in theory you could do that but not expand the picture by a lot.
It was not very useful since the ST generated a clean 32kHz video signal with correct vblank/hblank timings and no "border", unlike in color mode.
Doing overscan in monochrome was like doing overscan on VGA PCs, not really interesting. While in color, the purpose was to remove the borders that were not hblank/vblank.
@fenarinarsa @Seg If we stick to clean sync timings then indeed, it's not possible to start the screen earlier, or start the scanline earlier, or even extend the screen vertically (there would be room for more lines). There are simply no GLUE checks to trick.
The scanline length ("right border opening") is another matter though - that's possible to do. I would need to check my notes but somewhere around 80 extra pixels I think.
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mnemonicoverload
Troed Sångberg
fenarinarsa 