[A83] Re: Getkey loop

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: Getkey loop
From: Charlie Adams <charlieadams@myrealbox.com>
Date: Wed, 05 Jun 2002 17:41:06 -0500
In-Reply-To: <F97byxthLVgjR28SjWC00014e43@hotmail.com>
Reply-To: assembly-83@lists.ticalc.org


I just learned this a couple of weeks ago.:)  Say you do a "cp b", the 
carry flag (c) is set if a<b, nc if a>=b, z if a=b, and nz if a!=b.  Thanks 
to jynx in #tcpa for teaching me this.  #tcpa is a great place to go for 
z80 help.

>hello,
>
>Well, nc is for the carry flag, you want nz for the zero flag, when register
>a is equal (zero difference) to kY
>
>I think that should work,
>    Jimmy Pardey
>
>
> >X:
> >  B_Call _getkey   ;Gets a keypress
> >  cp kY    ;If key = [Y=]
> >  jp nc,StartMenu   ;Jump to StartMenu
> >  jp X    ;Repeat the loop (jump to X)
> >

References:

[A83] Re: Getkey loop

From: "Jimmy Pardey" <j_pardey@hotmail.com>

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