z80 timing... 6502 timing

From: Allison J Parent <allisonp_at_world.std.com>
Date: Sat Apr 17 10:11:41 1999

<65C02, because it was buillt in several conflicting versions. What about
<the Z-80 core? Whose? Which one? Speed, of course, should be "limited" t
<whatever was available in 1982. That certainly includes the Synertek (MOS

In 1982 all of the z80s in the market had the same hidden features
including the IX/IY 8bit ops. I know of no z80 that didn't have them.
Not all of them were available to the 6mhz spec though many could be
pushed. Also allowed is the 8085 (available as a 5-6mhz part then). Again
all of the 8085s had the extra unsupported instructions as they were deem
important!

Allison
Received on Sat Apr 17 1999 - 10:11:41 BST