Posted By
Litwr
on 2016-11-01
15:07:15
|  Re: Mandelbrot and Commodore computers
I wanted to get the true sport results. BBC Micro and Amstrad CPC have no screen off speedup. So C+4 works with screen on at 1.1 MHz. Commodore Basic 3.5/7 has good commands but it is much slower (50-100%) than Amstrad CPC or BBC Micro Basics. This makes the results. If we run Plus4 with screen off then it makes it about 60% faster. If we add "secret" NTSC boost then we get about 90% less time. However with slow Commodore Basic even this boost doesn't allow to catch up Amstrad CPC. Plus4 is the fastest with disabled screen only. BTW a BBC Micro enthusiast has just made a ML interactive Mandelbrot builder. It draws a screen in about 2 minutes. The next screens (zoom in) are drawn slower.
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