From: Ullrich von Bassewitz (uz_at_musoftware.de)
Date: 2005-04-01 13:00:34
Hi!
On Fri, Apr 01, 2005 at 12:31:19PM +0200, Spiro Trikaliotis wrote:
> IMHO, this differentiation is nit-picking.
Maybe. But it represents the statements in the official CPU docs. Someone
using a 65SC02 or 65C02 CPU will probably shake his head over the notation of
a Z register, because the CPU docs for these CPUs (and the doc for the 65816)
don't mention such a register.
STZ was an additional instruction for the 65SC02, 65C02 and 65816 CPUs, and it
is officially documented as "Store Zero".
When the 65CE02 came along, Commodore implemented a Z register and redefined
STZ for this CPU to mean "Store Z register". But the 65CE02 is a very rare CPU
(it was used in the C65), and was never officially available for sale. So in
my eyes it would by confusing to use this "Z register notation" when talking
about the 65SC02, 65C02 and 65816 CPUs.
Regards
Uz
--
Ullrich von Bassewitz uz@musoftware.de
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