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defs: Add Bt.Sec for atari and corsham
author Tormod Volden <debian.tormod@gmail.com>
date Sat, 07 Mar 2020 23:52:40 +0100
parents 03f26e88b809
children
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*****************************************

* See if character in "B" is a digit 0..9

* OTHER MODULES NEEDED: none

* ENTRY: B=character to test

* EXIT: CC zero=1 if digit, 0 if not

 nam Is Char a Digit?
 ttl Assembler Library Module


 section .text


IS_DIGIT:
 cmpb #'0 
 blo no not digit, zero cleared
 cmpb #'9 if equal, zero set
 bhi no not digit, zero cleared
 orcc #%00000100 set zero

no
 rts

 endsect