Re: A85: Pixel mover

To: assembly-85@lists.ticalc.org
Subject: Re: A85: Pixel mover
From: Dines Christy Justesen <c958362@student.dtu.dk>
Date: Wed, 12 Nov 1997 14:44:30 +0100 (MET)
Reply-To: assembly-85@lists.ticalc.org

2's complement :

-7 = NOT(00000111b)+1=11111000b+1=11111001b = F9h

So add a,$f9 adds -7 to a.

Dines
-----Original Message-----
From: Erik L Gillespie <egillespie@juno.com>
To: assembly-85@lists.ticalc.org <assembly-85@lists.ticalc.org>
Cc: assembly-85@lists.ticalc.org <assembly-85@lists.ticalc.org>
Date: 11. november 1997 21:30
Subject: Re: A85: Pixel mover


>i probably know this but can't think of what the answer is
>why would
>
>add a, $F9
>
>subtract 7 from a?
>
>Wyrmlord
>egillespie@juno.com
>


_______________________________________

Dines Justesen
Email: dines@post1.com or
       c958362@student.dtu.dk
WWW  : http://www.gbar.dtu.dk/~c958362/
_______________________________________

Prev: Re: A85: Pixel mover
Next: Re: A85: Pixel mover
Index(es):
- Main
- Thread