Add mapper 528

src/boards/vrcirq.h

@@ -0,0 +1,10 @@
+#ifndef _VRCIRQ_H
+#define _VRCIRQ_H
+
+void VRCIRQ_Init(void);
+void VRCIRQ_Latch(uint8 V);
+void VRCIRQ_LatchNibble(uint8 V, uint8 highBit);
+void VRCIRQ_Control(uint8 V);
+void VRCIRQ_Acknowledge(void);
+
+#endif /* _VRCIRQ_H */