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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 uppercase

* OTHER MODULES NEEDED: IS_LOWER

* ENTRY: B=ascii value of character to convert

* EXIT: B=ascii value of character in uppercase

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


 nam Convert Char to Uppercase
 ttl Assembler Library Module


 psect TO_UPPER,0,0,0,0,0

TO_UPPER:
 pshs cc
 lbsr IS_LOWER only lowercase can be converted to upper
 bne toupx
 subb #$20 make uppercase

toupx
 puls cc,pc

 endsect