Re: 6502 trashing memory cycles...

["David Wilson" <mcs6502@gmail.com>]

On Mar 5, 7:10 pm, "biel...@terra.es" <biel...@terra.es> wrote:
> I'm not saying that the 6502 doesn't internally do something useful
> during that cycles.
> I'm saying however that whatever it is, during these cycles, accessing
> the memory is not neccesary.
> During these cycles it does un-needed memory accesses.

This is true. Have a look at the 6809E for a chip that can release the
bus during dead cycles (a pin called AVMA (Advanced VMA) indicates
that the processor will use the bus in the following cycle). My
Stellation Mill card allows the motherboard 65(c)02 to run during
these periods.