16 Nov
2005
16 Nov
'05
7:31 p.m.
On 11/17/05, Roger Merchberger <zmerch at 30below.com> wrote:
Dunno enough about 68Ks (yet) but 6800/6809 CPUs only
have memory-mapped
I/O, so all that's needed is to buffer the lines (unless you're feeling
particularly foolhardy, like on the CoCo) and address decoding. Not exactly
a *lot* of hardware, as it were...
The 68000 is like the 6800/6809 in that regard... no special I/O bus
or instrunctions,
just memory decoding, and a lot of MOVE instructions,
-ethan