Posted By
MMS
on 2016-10-30
16:49:33
 |  Re: Mandelbrot and Commodore computers
Hi! Thanks for converting and sharing the results.
There was a lot of dispute about the Plus/4 "theoretical" speed, PI calculation was a nice example, but I was asked on the Ha'wangadra festival viewers, how much it represents the full machine's capabilities.
Certainly, if next to the CPU the GFX is tested, there are more factors, than the CPU itself.
So here in the Mandelbrot (despite it is depends heavily on CPU power), it uses the GFX abilities of the machine.
as I see, in case of Commodre, it is attribute mode,
I see, that BBC Micro B and CPC6128 are both SIGNIFICANTLY faster than Plus/4. At least 2x
Why?
Does the Plus/4 GFX or TED is so much more complicated (slow)?
Or the BASIC3.5 DRAW command is so much slower than the PLOT? (because on C+4 it can draw lines and points too, to th routine is more complicerd and slow).
What if a fast point drawing routine would be used? As your one, was able to draw 5250 pixel/second? would be the same results? Or Plus/4 would become the fastest again? So maybe a slow BASIC DRAW routine+ ATTRIBUTE kills our machines's dominance? 
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