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From: rayz@csustan.UUCP
Newsgroups: comp.sys.cbm
Subject: Re: 1750 & C-Power 128
Message-ID: <967@csustan.UUCP>
Date: Wed, 30-Sep-87 18:16:51 EDT
Article-I.D.: csustan.967
Posted: Wed Sep 30 18:16:51 1987
Date-Received: Sat, 3-Oct-87 01:54:33 EDT
References: <467@polyslo.UUCP> <15298@amdahl.amdahl.com>
Reply-To: rayz@csustan.UUCP (R. L. Zarling)
Organization: CSU, Stanislaus; Turlock, California
Lines: 14

In article <15298@amdahl.amdahl.com> dwl10@amdahl.amdahl.com (Dave Lowrey) writes:
>C-Power's shell resides in memory from $0801 to $17ff. Programs that
>run under the shell are loaded starting at $1800. No room to add
>any code.

I did a disassembly of the C64 shell a year and a half ago.  There *is* some
room for expansion.  The region from $0801 ends somewhere short of $17ff.
Then there is some storage which extends up to $17ff.  There is room for
expansion between the code and storage.  Sorry, I don't remember how much
right now.  It wasn't a lot...

Also, there was a lot of code which could be quite trivially shortened and
improved.  I opened up a *lot* of space for expansion by rewrites of
existing code.  Of course, you need a good symbolic disassembly to start
doing things like that.