Re: A83: Re: I am new

To: assembly-83@lists.ticalc.org
Subject: Re: A83: Re: I am new
From: benjamin99@juno.com (Alan C Johnson)
Date: Tue, 13 Oct 1998 20:16:06 -0500
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
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

Then if -7=249, -7=%11111001, but your sying -7 should equal %10000111
which is 135.  I don't understand

>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
>
>

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