Re: A86: rom calls

To: assembly-86@lists.ticalc.org
Subject: Re: A86: rom calls
From: Grams Family <grams@netcarrier.com>
Date: Mon, 11 May 1998 07:06:20
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <3553F8F0.C482E84E@mindspring.com>
Reply-To: assembly-86@lists.ticalc.org

At 02:34 AM 5/9/98 -0400, you wrote:
>
>Does anyone know what any of the following rom calls do?
>
>$4813
>$496F
>$4787
>

$4813 is _pop_OP1 (off of FP stack)

$496f calls $28cb, which I call _call_abs. This doesn't make any sense.
When you call _call_abs, the next three bytes should be an absolute
address. It then returns to the return address before the call _call_abs.
That's why all the calls on the end of ROM pg. 0 (about $2900 on) don't
have ret's after them - they don't need them.

$4787 is _check_STACK_mem. It checks if there is enough free memory to push
something onto the OP stack or the FP stack. It takes one parameter, the
amount of  memory needed, in hl.

I know this is kind of late, but I thought I'd answer anyway, so just
ignore this if it's redundant...

--Joshua

References:

A86: rom calls

From: Stephen Hicks <shicks@mindspring.com>

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