Start to introduce a 6526/8250.

Components/6526/6526.hpp

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+//
+//  6526.h
+//  Clock Signal
+//
+//  Created by Thomas Harte on 18/07/2021.
+//  Copyright © 2021 Thomas Harte. All rights reserved.
+//
+
+#ifndef _526_h
+#define _526_h
+
+#include <cstdint>
+
+namespace MOS {
+namespace MOS6526 {
+
+class PortHandler {
+
+};
+
+enum class Personality {
+	// The 6526, used in machines such as the C64, has a BCD time-of-day clock.
+	Model6526,
+	// The 8250, used in the Amiga, provides a binary time-of-day clock.
+	Model8250,
+};
+
+template <typename BusHandlerT, Personality personality> class MOS6526 {
+	public:
+		/// Writes @c value to the register at @c address. Only the low two bits of the address are decoded.
+		void write(int address, uint8_t value);
+
+		/// Fetches the value of the register @c address. Only the low two bits of the address are decoded.
+		uint8_t read(int address);
+};
+
+}
+}
+
+#include "Implementation/6526Implementation.hpp"
+
+#endif /* _526_h */

Components/6526/Implementation/6526Implementation.hpp

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+//
+//  6526Implementation.hpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 18/07/2021.
+//  Copyright © 2021 Thomas Harte. All rights reserved.
+//
+
+#ifndef _526Implementation_h
+#define _526Implementation_h
+
+namespace MOS {
+namespace MOS6526 {
+
+template <typename BusHandlerT, Personality personality>
+void MOS6526<BusHandlerT, personality>::write(int address, uint8_t value) {
+}
+
+template <typename BusHandlerT, Personality personality>
+uint8_t MOS6526<BusHandlerT, personality>::read(int address) {
+	return 0xff;
+}
+
+}
+}
+
+#endif /* _526Implementation_h */