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libsrc/c64/readjoy.s

@@ -0,0 +1,41 @@
+;
+; Ullrich von Bassewitz, 23.09.1998
+;
+; unsigned readjoy (unsigned char joy);
+;
+
+     	.export		_readjoy
+
+	.include	"c64.inc"
+
+
+.proc	_readjoy
+
+	tax			; Joystick number into X
+	bne    	joy2
+
+; Read joystick 1
+
+joy1:	lda	#$7F
+     	sei
+     	sta	CIA1_PRA
+     	lda	CIA1_PRB
+     	cli
+     	and	#$1F
+     	eor	#$1F
+     	rts
+
+; Read joystick 2
+
+joy2:	ldx	#0
+	lda	#$E0
+	ldy	#$FF
+	sta	CIA1_DDRA
+	lda	CIA1_PRA
+	sty	CIA1_DDRA
+	and	#$1F
+	eor	#$1F
+	rts
+
+.endproc
+