17 Apr
1999
17 Apr
'99
12:25 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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17 Apr
17 Apr
4:13 p.m.
New subject: CMOS 6502 variants (was Re: z80 timing... 6502 timing)
"Richard Erlacher" <edick(a)idcomm.com> wrote about CMOS 6502 variants:
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?
As far as chips bearing the actual 65C02 or 65C12 designations, there were only
two types:
1) The straight WDC design, licensed by almost everyone, including UMC.
2) The Rockwell version, which was the WDC design with the addition of
the bit instructions they had previously implemented in some
of their NMOS parts.
Commodore also designed a CMOS 6502 core, but AFAIK it was never actually
marketed as a 65C02.
Mitsubishi makes a line of CMOS almost-6502 microcontrollers. They have
changed their part numbering system repeatedly. Some representative parts are
in the 3745x series. Most of their newer controllers are based on an
almost-65816 core.
Many ASIC vendors including VLSI have 6502 cores in their portfolio, but
they tend to be synthesized and don't share any common heritage.
18 Apr
18 Apr
11:24 a.m.
New subject: CMOS 6502 variants (was Re: z80 timing... 6502 timing)
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12:45 p.m.
New subject: CMOS 6502 variants (was Re: z80 timing... 6502 timing)
I wrote:
Commodore also designed a CMOS 6502 core, but AFAIK it
was never actually
marketed as a 65C02.
Cameron replied:
Tell me more about this. To the best of my knowledge,
Commodore only ever
used NMOS (65xx), HMOS-1 (75xx) and HMOS-2 (85xx) in their computers *save*
the 65, which used the 4510 (modified 65CE02 with two onboard 6526s). HMOS
was, for its part, just a high-speed NMOS manufacturing process (hence H).
I received a data sheet from them many years ago, which I no longer have.
I don't recall the part number they were using. Perhaps I spoke to strongly
when I said that they designed it; it may be that they only wrote a data
sheet in order to guage customer interest. That was before they essentially
stopped selling their chips on the open market.
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