Re: cbm 8032 motherboard + 4164

On 13/10/2016 21:07, Gerrit Heitsch wrote:
> Even if you couldn't disable display DMA, drawing the upper and lower 
> border would take too much time. Reading $3FFF means it will refresh 
> row $FF, but not the other 255 rows...

The $3fff fetch could have had the 8 bit cycle in it. Then they could 
have done something else with those extra 5 cycles per line.

But they were designing a computer that would get replaced in a couple 
of years and so spending any more time on it than they had to was wasted 
effort. So I guess the answer was that it was easier to do it the way 
they did, or at least they thought it was.


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