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level1 krn: Fix scheduler bug that only affected 6309 The original 6809 binary was correct, but it was disassembled and interpreted wrongly, so that reassembly went wrong on 6309.
author Tormod Volden <debian.tormod@gmail.com>
date Sun, 25 Jan 2015 22:36:02 +0100
parents 03f26e88b809
children
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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


 section .text


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

yes
 orcc #%00000100 set zero

exit
 rts

 endsect