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libsrc/atari/clrscr.s

@@ -0,0 +1,47 @@
+;
+; Christian Groessler, Apr-2000
+;
+; void clrscr (void);
+;
+
+	.export		_clrscr
+
+	.include	"atari.inc"
+
+.ifdef DIRECT_SCREEN
+
+	.importzp	ptr1
+
+_clrscr:lda	SAVMSC		; screen memory
+	sta	ptr1
+	lda	SAVMSC+1
+	clc
+	adc	#>(40*24)
+	sta	ptr1+1
+	lda	#0		; screen code of space char
+	ldy	#<(40*24)	; 40x24: size of default atari screen
+	ldx	#>(40*24)
+_clr1:	sta	(ptr1),y
+	dey
+	bne	_clr1
+	sta	(ptr1),y
+	dex
+	bmi	done
+	ldy	ptr1+1
+	dey
+	sty	ptr1+1
+	ldy	#255
+	jmp	_clr1
+
+done:	sta	COLCRS
+	sta	ROWCRS
+	rts
+
+.else
+
+	.import		putchar
+_clrscr:
+	lda	#ATCLR
+	jmp	putchar
+
+.endif