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o dwio for Atari now uses routines in ROM, so dwread/dwrite stripped of Atari o Added NMI code (as a conditional) to clock
author Boisy Pitre <boisy.pitre@nuance.com>
date Tue, 31 Jul 2012 11:54:02 -0500
parents 7d70b7e1cb21
children aaba193af04f
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*****************************************

* See if character in "B" is a control character
* controls are defined as $00..$1F and $7F+

* OTHER MODULES NEEDED: none

* ENTRY: B=character to test

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

 nam Is Char a Control?
 ttl Assembler Library Module


 psect IS_CNTRL,0,0,0,0,0


IS_CNTRL:
 cmpb #$7f
 bhs yes
 cmpb #$1f
 bhi exit not control, zero cleared

yes
 orcc #%00000100 set zero

exit
 rts

 endsect