First stab at adding Mockingboard support.

[apple2] / src / mos6522via.h

diff --git a/src/mos6522via.h b/src/mos6522via.h
new file mode 100644 (file)
index 0000000..4d494a9
--- /dev/null
+++ b/src/mos6522via.h
@@ -0,0 +1,31 @@
+// Mockingboard support
+//
+// by James Hammons
+// (C) 2018 Underground Software
+//
+
+#ifndef __MOS6522VIA_H__
+#define __MOS6522VIA_H__
+
+#include <stdint.h>
+
+struct MOS6522VIA
+{
+       uint8_t orb, ora;               // Output Register B, A
+       uint8_t ddrb, ddra;             // Data Direction Register B, A
+       uint16_t timer1counter; // Timer 1 Counter
+       uint16_t timer1latch;   // Timer 1 Latch
+       uint16_t timer2counter; // Timer 2 Counter
+       uint8_t acr;                    // Auxillary Control Register
+       uint8_t ifr;                    // Interrupt Flags Register
+       uint8_t ier;                    // Interrupt Enable Register
+};
+
+
+extern MOS6522VIA mbvia[];
+
+
+void ResetMBVIAs(void);
+
+#endif // __MOS6522VIA_H__
+