[A83] Can I have a small explanation "D Weiss?"

To: assembly-83@lists.ticalc.org
Subject: [A83] Can I have a small explanation "D Weiss?"
From: "Steve Watson" <fif_freak00@hotmail.com>
Date: Tue, 13 Mar 2001 20:30:18 -0700
Reply-To: assembly-83@lists.ticalc.org


I mean for the getkey stuff...I understand a few things...the ei (enable 
interrupts, but I don't know what interrupts are) and the bcall and jr 
stuff, but _getcsc, or a, and HALT I don't really know.  Could you explain 
those a little for me?  I'd really appreciate it!
------------------
You can use _getkey in ion, but the ram gets cleared if you turn it off.
The alternative to _Getkey:

waitkey:
   ei
WKA_loop:
   HALT
   bcall(_getcsc)
   or a
   jr z, WKA_loop
   ret

This code when CALLed, waits for a key to be pressed and the pressed key is
returned into register A.
------------------
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com