Patched version, working in TI 89 Titanium, from the original file written by Ben Scherrer.


diff -ur pctfull/src/PCTools/pct-prgm/Features/SYSTEM.s pctfull-89ti/src/PCTools/pct-prgm/Features/SYSTEM.s 
--- pctfull/src/PCTools/pct-prgm/Features/SYSTEM.s	2004-11-09 00:06:22.000000000 +0100 
+++ pctfull-89ti/src/PCTools/pct-prgm/Features/SYSTEM.s	2007-09-28 21:41:26.000000000 +0200 
@@ -32,6 +32,7 @@ 
 	clr.w	d0 
 	move.b	CALCULATOR,d0 
 	addq.w	#1,d0			;use PREOS ramcall while stay 
+	andi.w	#255,d0 
 	rts				;compatible with old pct source code