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git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/atari/readjoy.s

@@ -0,0 +1,30 @@
+;
+; Christian Groessler
+;
+; unsigned readjoy (unsigned char joy);
+;
+
+     	.export		_readjoy
+
+	.include	"atari.inc"
+
+
+.proc	_readjoy
+
+	and	#3		; fix joystick number
+	tax			; Joystick number (0-3) into X
+
+; Read joystick
+
+	lda	STRIG0,x	; get button
+	asl	a
+	asl	a
+	asl	a
+	asl	a
+	ora	STICK0,x	; add position information
+	eor	#$1F
+	ldx	#0		; fix X
+     	rts
+
+.endproc
+