Re: 1551 & plus4

From: Nicolas Welte (
Date: 2001-05-09 10:34:06 wrote:
> On Tue, 8 May 2001, [ISO-8859-1] Marko Mäkelä wrote:
> > On Tue, 8 May 2001, Gene Ehrich wrote:
> >
> > > Can I use a standard Commodore Serial DIN cable to connect a 1551 to a Plus4.
> >
> > Doesn't the 1551 come with a cartridge that is installed to the plus/4's
> > cartridge port?  As far as I know, the 1551 doesn't have a serial bus at
> > all.
> Right.  If you dont have the cartridge, you're going to be pretty much
> helpless, since the 1551 is a very rare device.

The cartridge can be rebuilt, but it really doesn't make sense, the
manufacturing and engineering cost (or time, as you like) would be quite
high. All there is is a PLA to generate the chipselect line for the I/O chip,
a 6523T. This 6523T is a strange beast: It is a 28pin version of the better
known 40pin 6523, and is missing some port lines. And the 6523 in turn is a
simple, but pin compatible version of the well known 6525. Unfortunately, the
6525 isn't easy to obtain :-( Devices with that chip include the CBM-II
series, the 1551 itself, the CBM Magic Voice, and I think the CBM IEEE488
cartridge for the C64.

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