CBM 720 questions

From: Marko Mäkelä (msmakela_at_cc.hut.fi)
Date: 2001-10-16 08:58:40

The 600/700 a.k.a. B series a.k.a. CBM II machines seem to be really
business-oriented.  There is an interface for a cassette unit, but no
firmware to drive it.  An external cartridge is required for accessing
cassettes.  Thanks to André Fachat and Ullrich von Bassewitz for
documenting all this on FUNET.

It was a small disappointment for me to find this out.  But I think I will
use the cassette port anyway for my data link.  After all, it is the same
connector as in other 8-bit Commodores (except the 264 series), and the
RS-232 port might be used for something else.

One thing is unclear to me: What are the main differences between the 600
and the 700 series?  I guess that the main difference between x10 and x20,
x=6 or 7, is the amount of memory: 128 or 256 kilobytes.  My 720 does not
contain any add-on boards: just two adapter boards for localized KERNAL
and character generator EPROMs.

One more question: Does anyone happen to have three spare rubber pads
lying around?  The keyboard is missing one, and the computer is missing
two of them.  The pads are circular, with a diameter of about 2
centimeters or 3/4 inches.


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