6502/Z80 speed comparison (was MITS 2SIO serial chip?)

From: ajp166 <ajp166_at_bellatlantic.net>
Date: Fri Dec 21 20:40:32 2001

From: Richard Erlacher <edick_at_idcomm.com>


>without modification, in most cases, on a Z80,.by the time the 6502
became
>popular. Now, I've always believed the 6502 at 1 MHz to compare
favorably with
>the 4 MHz Z80, but I used the Z80 running CP/M 2.2 to do useful work,
since it
>was a lot more trouble squeezing useful work out of a 6502 back in
'78-'79.


If anything I'd say CP/M was a factor more than any virtue of Z80. I say
that as
most "z80" code underused the Z80 as a fancy 8080. One may wonder if a
cp/m like (or better!) OS existed for 6502 such that it was portable or
easily
ported if things may have developed differently.

Allison
Received on Fri Dec 21 2001 - 20:40:32 GMT