Working in P500 code

git-svn-id: svn://svn.cc65.org/cc65/trunk@919 b7a2c559-68d2-44c3-8de9-860c34a00d81
2001-09-14 09:52:30 +00:00
parent cd1598fa89
commit c4a49faf48
7 changed files with 204 additions and 69 deletions
--- a/libsrc/cbm510/clrscr.s
+++ b/libsrc/cbm510/clrscr.s
@@ -0,0 +1,36 @@
+;
+; Ullrich von Bassewitz, 14.09.2001
+;
+
+	.export		_clrscr
+	.import		plot
+
+	.include	"zeropage.inc"
+	.include	"io.inc"
+
+; ------------------------------------------------------------------------
+; void __fastcall__ clrscr (void);
+
+.proc	_clrscr
+
+	lda	#0
+	sta	CURS_X
+	sta	CURS_Y
+       	jsr	plot		; Set cursor to top left corner
+
+	ldx	#4
+	ldy	#$00
+	lda	#$20	   	; Screencode for blank
+L1:	sta	(CharPtr),y
+   	iny
+   	bne	L1
+   	inc	CharPtr+1
+	dex
+	bne	L1
+
+	jmp	plot		; Set screen pointer again
+
+.endproc
+
+
+