z80 timing... 6502 timing

From: Allison J Parent <allisonp_at_world.std.com>
Date: Sat Apr 17 14:33:06 1999

The 6502 series ahd all sorts of undocumented opcodes and they tended to
change with later versions.

<THe 65xx stuff is quite known, but what has been new to my ears are the
<8085 'hidden' operations.

Those were more useful as the 8085 had some rather open holes in the
instruction set. The z80 also had a raft of them all commonly supported
though officially unofficial. and none were compatable with the 8085 hidden
ops (in either direction).

Allison
Received on Sat Apr 17 1999 - 14:33:06 BST