20 Apr
2006
20 Apr
'06
10:40 a.m.
On Thursday 20 April 2006 12:03 am, Chuck Guzis wrote:
On 4/19/2006 at 11:34 PM Roy J. Tellason wrote:
Yeah, I remember those two...
> But a Z80 *won't* run 808[05] code.
Well, a Z80 will run 8085 code that limits itself to 8080 instructions.
But the 8085 has two documented instructions (RIM SIM) that the 8080
doesn't have-- and a few more "undocumented" instructions
(nonetheless used by many
embedded programs) that neither the 8080 nor the Z80 has.
I remember some real early magazine articles, and have since found a bit of
stuff online, that talked about undocumented opcodes for the z80, but I've
not run across that info for anything else. And it seems to depend a lot on
what brand of chip, etc. so I've never been really tempted to use them.
Initially I thought that the Rabbit was a good
idea--until I started to
program it. What did you do with (insert a list of instructions)? And an
interesting bug or two. Feh.
I haven't yet looked at that, got enough going on here to keep me busy...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin