A86: Re: reading ports

To: assembly-86@lists.ticalc.org
Subject: A86: Re: reading ports
From: jimi malcolm <malcolmj1@juno.com>
Date: Wed, 19 Jan 2000 19:09:23 -0500
Reply-To: assembly-86@lists.ticalc.org


> From: Matt C <snoborder420@yahoo.com>
> Subject: Re: A86: Problem reading ports
> 
> you forgot to read in from the ports!
> new code!
> 
> > 	ld a,$BF
> > 	out (1),a
>  nop
>  nop
>  in a,(1)
> ;that code reads in from the port
> > 	bit 5,a
> > 	jr z,Second
> > 	bit 6,a
> > 	jp z,Exit   ;heres where it breaks

you don't need those nops.  the hardware doesn't need any time to get the
results really.

jimi malcolm
mailto:malcolmj1@juno.com
http://guide.ticalc.org

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