[PlunderBunny]

I'm running this on a BBC micro emulator running at period-accurate speed, and it's taking just under a minute to draw one line. So I think it's going to finish in about 4 hours, which would make sense - approximately twice as fast as the Acorn Electron.

[PlunderBunny]

Update: Finished in only 2 hours 30 minutes.

[tom_]

The Electron runs extra slowly in MODE 1 as the video system needs 100% of the RAM bandwidth to form the display. The CPU essentially ends up paused during the visible portion of each scan line, so the effective speed is probably more like 0.6 MHz.