Re: LF: On-calc assembler

To: list-fargo@lists.ticalc.org
Subject: Re: LF: On-calc assembler
From: SonicWarez@aol.com
Date: Fri, 13 Dec 1996 23:49:51 -0500
Reply-To: list-fargo@lists.ticalc.org

In a message dated 96-12-13 23:00:34 EST, you write:

>
>
>>I was working on an oncalc assembler (it's almost ready) and I intended 
>>to do just that; Patch all exception vectors and save stackpointers prior 
>>to running a program. It wouldnt help problems like memory trashing but 
>>it'd propably help a bit.
>>
>>//Sasq (Jonas Minnberg)
>>
>>
>
>I've been playing around with exception vectors today and ran into a
>problem.  Whenever you try to directly change any of the vectors (actually
>the only one I've tried is the illegal instruction vector), the calculator
>gives a protected memory violation error.  Now, this error does not lock up
>the calc.  It's like a typical TI-92 error dialog box.  Although the calc
>doesn't lock up, fargo is disconnected and unreachable at this point.
>I've tried a few things, including disabling interrupts by putting $2700 in
>the SR before writing to the vectors, but nothing seems to work.  I always
>get that error.
>Any suggestions?
>I'm rather new to programming on the 92, so I may be missing something, too.
>
>-Mark-

u need to enable the supervisor bit read the text Jimmy Mardell relesed a
while back