diff --git a/device.cpp b/device.cpp
new file mode 100644
index 0000000..341f754
--- /dev/null
+++ b/device.cpp
@@ -0,0 +1,14 @@
+#include <cstdint>
+
+#include "device.h"
+
+
+uint8_t device::read_byte(const uint16_t addr)
+{
+	uint16_t v = read_word(addr & ~1);
+
+	if (addr & 1)
+		return v >> 8;
+
+	return v;
+}