A92: ti92 internals

To: fargo <assembly-92@lists.ticalc.org>
Subject: A92: ti92 internals
From: Christopher Lambert <clambert@sparcy.geneva.edu>
Date: Sat, 20 Sep 1997 20:02:12 -0400 (EDT)
Reply-To: assembly-92@lists.ticalc.org


I am planning to add my own stuff into my TI92, and I would like someone 
who knows to tell me if this is possible or not, and if it is possible, 
what problems I would I be likely to hit... (other than standard 
debugging...)

I plan to solder my own decoder chips up to the data and address buses to 
add in my own I/O ports and my own ROM chip(s).  The rom chips would 
have functions in them on how to run the new I/O ports.  If I were to 
compile these functions as fargo programs, would I be able to use the 
core[exec] function to call them?

I also need to know what part of RAM fargo is stored in, and what part of 
RAM the OS is stored in.  Basically, I plan on corrupting the OS memory, 
but I need to keep Fargo in tact.  I need to know which part of memory I 
can corrupt.  Once my driver program is running, I don't plan on 
returning to the OS, so I can use that portion of memory as I like.

Thanks,
Chris
clambert@geneva.edu

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