Re: LF: On-calc assembler
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Re: LF: On-calc assembler
To write to low memory (below $120), a bit in a certain port needs to be
set. See ports.txt
On Fri, 13 Dec 1996, Hmmm wrote:
>
> >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-
>
>
References: