9 Nov
1999
9 Nov
'99
12:33 p.m.
Dwight Elvey <elvey(a)hal.com> wrote:
We shouldn't be too skeptical until we really
look at what
the processor can really do. I don't have any info
on 6809's
I'm familiar with them, and at 1 MHz the fastest instructions
take 2 us. That doesn't let you do very much when you need
to transfer a byte every 16 us. IIRC just an iteration
of the loop to poll DRQ takes 7 or 8 us if you don't use
some fancy tricks.