Re: A83: Re: I am new

To: assembly-83@lists.ticalc.org
Subject: Re: A83: Re: I am new
From: John Kugelman <kugelman@mnsinc.com>
Date: Mon, 12 Oct 1998 21:23:24 -0400
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
References: <4.1.19981012154904.00a947a0@esper.com>
Reply-To: assembly-83@lists.ticalc.org

Smiths wrote:
> 
> How do you give a number a negative??

You can interpret a byte or word however you want.  What you have stored
in memory is not a number; it's just a series of bits.  The context will
tell you whether or not the number is signed - usually negative numbers
are indicated with the left most bit set.  I believe the Z80/ROM uses
two's-complement encoding in such a context.

This is not unique to the Z80 or TI-83.  It's applicable to any
architecture I know of.

-- 
John Kugelman.  kugelman@mnsinc.com

I believe we can change anything.
I believe in my dream.
    - Joe Satriani

References:

Re: A83: Re: I am new

From: Smiths <smithrh@esper.com>

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