[A83] Re: Getkey loop

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: Getkey loop
From: "Jimmy Pardey" <j_pardey@hotmail.com>
Date: Wed, 05 Jun 2002 15:51:45 -0700
Reply-To: assembly-83@lists.ticalc.org





Neat! so you don't have to do a fancy subtract thing for < > tests, just do 
a cp and read z and c! I think that that is not the right way to do a 
keytest, however (°

>
>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)
> > >
>
>




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