Re: //e CPU chip differences

[shack@deimos.frii.com (Randy Shackelford)]

In article <5vah47$jrv@nntp.seflin.org>,
Joe Cairnes <p035631b@pb.seflin.org> wrote:

>I have seen at least five different chips in the 6502
>sockets of //es and would like to know how they differ.  I
>believe those with "C" in the middle have more operation
>codes (are enhanced) than do those without "C" but the
>variety of them, especially the "S" is a mystery to me.
>
>Here are the names I have noted:
>
>65C02A  G65SC02P-2  R65C02P1  370-6502  R6502-4C
>
>Please tell me here or at p035631b@pb.seflin.org what the
>different chips can do.

65C02A - a designation typical of NCR supplied chips. The A denotes a 1 mHz
part. B is 2 mHz, and C is 4 mHz.

G5SC02P-2 - more like a GTE part. SC is the same as C, and P means a plastic 
package and 2 means 2 mHz.

R65C02P1 - A rockwell 65C02. It has extra bit manipulation instructions not
present on other 65C02s or 65802/816, so not to be used. P should mean plastic
package and 1 for 1 mHz.

370-6502 - Typical for a Synertek NMOS 6502 like in ][s and ][ pluses.

R6502-4C - probably another Rockwell part.

This is more or less meaningless unless you're writing bit banging assembly
code. Otherwise all 6502s, C02s, and 802/816s are gonna look the same as all
others.
-- 
Randy Shackelford                                 
shack@frii.com