A83: Re: Quick Question on Ipoint

To: <assembly-83@lists.ticalc.org>
Subject: A83: Re: Quick Question on Ipoint
From: "Kouri" <Kouri@ucdavis.edu>
Date: Thu, 16 Dec 1999 13:13:28 -0800
References: <19991216194332.82457.qmail@hotmail.com>
Reply-To: assembly-83@lists.ticalc.org


First of all, I don't think that ipoint changes the z flag, but anyway...
The Z flag is really just a bit in the F register (F is for Flags).
There are four instructions you can do in a conditional case: jr, jp, call, and ret.
Example:
 ld a,5
 cp 5          ; Compares 5 to A, sets appropriate flags
 jr z,Ais5    ; Jumps if the zero flag is set (which it should be)

Is that what you were asking for?

----- Original Message ----- 
From: "John Girard" <ionidas@hotmail.com>
To: <assembly-83@lists.ticalc.org>
Sent: Thursday, December 16, 1999 11:43 AM
Subject: A83: Quick Question on Ipoint

I know that Ipoint can be used to test pixels, and I've read that it toggles 
a Z flag, 0 being on, and 1 being off (I believe, might be other way 
around). How do I access the data in Z to check it?

References:

A83: Quick Question on Ipoint

From: "John Girard" <ionidas@hotmail.com>