Share i8080 and Z80 I/O implementations.

Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>

src/InputOutput.cpp

@@ -0,0 +1,38 @@
+#include "stdafx.h"
+#include "InputOutput.h"
+
+EightBit::InputOutput::InputOutput() {
+}
+
+uint8_t EightBit::InputOutput::readInputPort(uint8_t port) {
+	OnReadingPort(port);
+	auto value = input[port];
+	OnReadPort(port);
+	return value;
+}
+
+void EightBit::InputOutput::writeOutputPort(uint8_t port, uint8_t value) {
+	OnWritingPort(port);
+	output[port] = value;
+	OnWrittenPort(port);
+}
+
+void EightBit::InputOutput::OnReadingPort(uint8_t port) {
+	PortEventArgs event(port);
+	ReadingPort.fire(event);
+}
+
+void EightBit::InputOutput::OnReadPort(uint8_t port) {
+	PortEventArgs event(port);
+	ReadPort.fire(event);
+}
+
+void EightBit::InputOutput::OnWritingPort(uint8_t port) {
+	PortEventArgs event(port);
+	WritingPort.fire(event);
+}
+
+void EightBit::InputOutput::OnWrittenPort(uint8_t port) {
+	PortEventArgs event(port);
+	WrittenPort.fire(event);
+}