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Added ClrScrn and CapsLock functionality for Atari VTIO
author Boisy Pitre <boisy.pitre@nuance.com>
date Mon, 10 Dec 2012 16:27:38 -0600
parents 7d70b7e1cb21
children aaba193af04f
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***************************************************

* Convert character in "B" to lowercase

* OTHER MODULES NEEDED: IS_UPPER

* ENTRY: B=ascii value of character to convert

* EXIT: B=ascii value of character in lowercase

* Note: control codes, etc. are not effected.


 nam Convert Char to Lowercase
 ttl Assembler Library Module


 psect TO_LOWER,0,0,0,0,0

TO_LOWER:
 pshs cc
 lbsr IS_UPPER only uppercase can be converted
 bne tolox no upper, exit
 addb #$20 make lowercase

tolox
 puls cc,pc

 endsect