A83: Beginner's Question

To: <assembly-83@lists.ticalc.org>
Subject: A83: Beginner's Question
From: "Dale Watson" <merlin@cinternet.net>
Date: Sun, 7 Jan 2001 18:34:06 -0500
References: <01BFEE8E.81AB09E0@bw2-136pub213.bluewin.ch>
Reply-To: assembly-83@lists.ticalc.org


Hi,

I am new to Assembly programming on TI-83 Plus.  I have tried to get the
"GetKey" function to work on VTI, but it does not appear to respond to
keypresses and if I interrupt it with the Debugger, it shows it at a "halt"
instruction at 021Bh.  Following is my source code, which I assemble using
the Chaos assembler.  Can anyone suggest why this does not seem to work in
VTI?  (I have NOT tried to put this into the actual calculator.)

_GetKey              .equ     4972h

Loop:
 rst 28H
 .dw _GETKEY
 cp $21
 ret z
 jr Loop
 .end
 .end

Scot Watson

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