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From: jamesv@hplsla.UUCP (jamesv)
Newsgroups: net.micro.cbm
Subject: Re: overlaying compiler
Message-ID: <6300003@hplsla.UUCP>
Date: Mon, 9-Jun-86 12:53:00 EDT
Article-I.D.: hplsla.6300003
Posted: Mon Jun  9 12:53:00 1986
Date-Received: Sat, 14-Jun-86 06:32:53 EDT
References: <262@usl-pc.UUCP>
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Nf-ID: #R:usl-pc:-26200:hplsla:6300003:000:1716
Nf-From: hplsla!jamesv    Jun  9 09:53:00 1986


I have a copy of "Oxford Pascal" which seems to meet some of your
requirements.  Please note that my responses come straight from their
manual and I have not tried any of these operations.  If anyone else
has used this compiler, your comments would be appreciated.  

> Needed: A Pascal or "C" compiler for the C-64 that will do overlays.
> 
> Requirements:
>  a) have provisions for overlays, so that I can fit the program into
> 40K of RAM. Hopefully, similar to UCSD "SEGMENT" procedures.

Oxford Pascal has the ability to "chain" programs.  While this is
not the same as overlays, it may satisify your requirements.  You can
pass global variables between the old and new programs.

>  b) It must include an adequate ML interface, so that I can use my
> interrupt code and various other necessary routines. They total about
> 4K, so adequate space is necessary to place them in.

Section 3.10.1 of the Oxford Pascal manual describes the assembly
language interface.  From the description, it looks like interfacing
to your routines would be straight forward.  No mention is make of
interrupts.

>  c) reasonably compact object (probably means p-code). Speed is no
> problem, due to the ML. Interpreted BASIC would be fast enough.

I don't have any info on this but it does appear that Oxford Pascal
compiles to true machine code, not p-code.

>  d) If possible, not use the area from $c600 to $d000, where Mike J
> Henry's fastloader resides, and use the LOAD routine to load overlays.
> Or at least have it so that I can easily tie in my own 1541 speedup.

The manual says that the top of memory pointer can be set to $c000
to "prevent Pascal from overwriting these locations."

James Vasil
hplabs!hplsla!jamesv