Re: A86: Test Operations

Re: A86: Test Operations

• To: assembly-86@lists.ticalc.org
• Subject: Re: A86: Test Operations
• From: LGB240@aol.com
• Date: Fri, 12 Jun 1998 11:22:17 EDT
• Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
• Reply-To: assembly-86@lists.ticalc.org

In a message dated 98-06-12 11:11:33 EDT, you write:

> How do I check if A < n? A > n?
>  
do
 cp  n

the cp instruction basically does a  sub n, therefore it affects the flags,
but it doesn't change any register besides the flag register, so A has the
same value still in it.
so
cp n
jr  z,A_is_equal_to_n  ;since if a-n=0 then they must be equal
jr  c,n_is_greater_than_A  ; since if n is > then a, then we will need a carry
in a-n
jr  n_is_less_than_A  ;since it is the only other option

Skip Jordan
email: LGB240@aol.com
IRC:    LGB240
ICQ:    12181001

• Re: A86: Test Operations
• From: Joshua Grams <j3grams@earthling.net>

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