Message-ID: <443@inuxd.UUCP>
Date: Wed, 8-Feb-84 12:50:09 EST
Article-I.D.: inuxd.443
Posted: Wed Feb 8 12:50:09 1984
Date-Received: Fri, 10-Feb-84 02:15:58 EST
References: teklds.112, <354@sytek.UUCP>
Organization: AT&T Consumer Products Div., Indianapolis
Lines: 34
+
To best understand how you find out about the deep
dark secrets of the Commodore operating system, simply
look at Commoodore's previous designs (ie: the PET).
The PET has been around since 1977 and the 64 is just
a spin off of the PET theme. The operating system is
almost identical. And there is a tremendous amount of
info available for the PET (if you can get past the
shallow stuff in the B. Dalton bookstore). Prior to
1980 however, this was not the case. But Commodore got
wise and in a book published by Commodore (England)
called "The PET Revealed" they told all - or at least
started to tell all. A book pubished by Compute! called
"Programming the PET/CBM" is a literal encyclopedia of
info on the kernal. Another book written by Jim Strasma
(of Midnite/PAPER fame) is the third edition of the
PET users guide, which has excellent memory map cross
reference between original PETs, Upgrade PETs, 4.0 BASIC
PETs, 80 column CBMs, and Fat 40's. It's the same
operating system - just located in a different place
in memory. (minor adjustments for the most part).
This same operating system is used in the VIC and 64.
I have had an Upgrade PET since 1979, and it was like
pulling teeth just to get a schematic back then. Now
with Sams publishing the Programmer's Reference Guide
and with such excellent magazines such as Compute! there
is no reason to think that they are hiding any secrets.
Well, I guess I don't have any more secrets either.
Jeff Porter (inuxd!porter)
AT&T Consumer Products
Indianapolis
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