need a source of 7501 micros

[Hans Franke]

Am 2 Jun 2005 11:01 meinte Allison:
> >Subject: need a source of 7501 micros
> >   From: Chris M <chrism3667 at yahoo.com>
> >   Date: Tue, 31 May 2005 19:16:31 -0700 (PDT)
> >     To: cctech at classiccmp.org

> >....as used in the Commodore Plus 4. Preferably new
> >*lol*. Hey...you never know...

> You'd be mighty lucky to get what you want.

> The 7501 is a mask programmed 4bit micro with LCD driver
> containing a 1024byte program rom and 96 nibbles of ram.
> Where used it's a custom part due to the rom.

> Know the part well as I used to be the product engineer.

Well, seams to be a close miss :)

The 7501 is a Commodore 6502 or to be more exact, its
the HMOS version of the NMOS 6510 as used in the C64,
which is a rather plain 6502 with one 7 bit paralell
port on chip. Later on the 8501 was done as a result
of another process change, eventualy leading to the
8502 as used in the C128.

So, if you search for a 7501 replacement, any 6510
might do it ... with some additional soldering, since
Commodore shifted the pins arround with every version.


Gruss
H.
--
VCF Europa 6.0 am 30.April und 01.Mai 2005 in Muenchen
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