Re: A83: Flags

To: assembly-83@lists.ticalc.org
Subject: Re: A83: Flags
From: benjamin99@juno.com (Alan C Johnson)
Date: Mon, 14 Sep 1998 16:54:14 -0500
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-83@lists.ticalc.org


To set a flag: (we'll do textInverse)

	set	textInverse,(iy+textFlags)

To reset it:

	res	textInverse,(iy+textFlags)

To check it:

	bit	textInverse,(iy+textFlags)

The Z flag is set if the flag is set.  So, you can:

	jr	z,XXXX
	jp	z,XXXX
		or
	call	z,XXXX


There's always an iy offset for a flag and a bit number.

		textInverse,(iy+textFlags)
		    ^		^
		    |		|
		bit number	iy offset

Look at some of the TI asm docs at ti .com.  Hope this helps

>
>Can somebody help me.  I am only new to asm programming on the ti-83's 
>and
>I would like some information on how to set and read the various flags 
>on
>the calculator.  I have been able to set the flags to one value, e.g. 
>I
>have been able to change from radians to degress using set
>trigdeg,(iy+trigflags) but I can't set this to radians and I don't 
>know how
>you can read the flag back.  Can someone please tell me how.
>
>----------------------
>From Alistair.
>Any computer problems?
>e-mail me about them!
>----------------------
>

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