Re: A86: Basic to Asm Variable Transfer

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Basic to Asm Variable Transfer
From: Dux Gregis <assets@eden.rutgers.edu>
Date: Sat, 30 May 1998 20:57:43 -0400
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
References: <000801bd8be0$70551040$9ff4ffd0@matt>
Reply-To: assembly-86@lists.ticalc.org




Matt2000 wrote:

> >>I need help transferring variables from basic to asm for a game I am
> making.
> >You could use _rclx and _rcly (don't remember the equates).  They put the
> >values of the BASIC variable in x/y in _OP1.
>
> Hmm.. I know you can load any external variable by using _findsym. This (If
> I remember correctly), will have HL pointing to
> the data and the correct ram page set for the start of the variable data.
> Then for Real Variables use _mov10b (I think), which would move 10 bytes
> from (HL) to OP1. Then there you go. If you are needing strings you will
> have to use block move operations (see (sqrt)PRGRM template on Dux Gregis's
> site for Absolute addressing block move operation examples).
> Of course this is all of the top of my head any I may (and often am) be
> incorrect.

Actually, bde points to the start of the data.  You want to do something like
this:

 ld hl,variable_name
 rst 20h
 rst 10h
 ld a,b
 ex de,hl
 call _ABS_MOV10TOOP1
 call _convop1

I don't remember what registers it will end up in.  Probably ahl.

References:

Re: A86: Basic to Asm Variable Transfer

From: "Matt2000" <matt2000@gte.net>