A89: Re: ROM calls

To: <assembly-89@lists.ticalc.org>
Subject: A89: Re: ROM calls
From: "Dux Gregis" <assets@eden.rutgers.edu>
Date: Wed, 18 Nov 1998 20:30:33 -0500
Delivered-To: assembly-89-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-89@lists.ticalc.org


The ROM table is a table of addresses (longword each) pointing to the ROM
calls.  The locations of the calls can change with each ROM version, but the
table won't; this means that code using the ROM table to find the ROM calls
(rather than just calling the address directly) will be compatable with all
versions of ROM.  So, ($c8) is the pointer to the ROM table, and will be the
pointer to the ROM table in all ROMs.  All calcs that support assembly
programming have a table like this.
>From looking at the shell include files, there appears to be near 700 calls.
About 50 of these calls are described in the plushell and doorsos
documentations.



>
>I've heard this in the discussions, $C8 is a pointer to the adress of the
ROM
>table on the TI89.  This means absolutely nothing to me, but it sounds
>important.  Can some one please explain this to me?  Also, is there a list
of
>all the known ROM calls yet?
>
>~Chris

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