17 Apr
1999
17 Apr
'99
4:25 p.m.
Yes, but there were three versions, at least, one being the Rockwell, one
being the MOS-Technology , and the third was the Synertek/Western Design
Center version. The VLSI Systems version was different from the Rockwell,
but I don't know whether it was a completely different one or whether it
fell in with one of the others. UMC made one, as did MITSUBISHI, however.
I don't know where they fit in either. Do you?
Dick
-----Original Message-----
From: Sellam Ismail <dastar(a)ncal.verio.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Saturday, April 17, 1999 3:14 PM
Subject: Re: z80 timing... 6502 timing
On Sat, 17 Apr 1999, Allison J Parent wrote:
dastar(a)siconic.com
The 6502 series ahd all sorts of undocumented
opcodes and they tended to
change with later versions.
The 65C02 version effectively ended the regular 6502 undocumented opcodes
since it added a few new instructions and some new addressing modes for
existing instructions that took on the opcodes of some of the previously
undocumented ones.
Sellam Alternate e-mail:
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