There is already an existing project (albeit defunct) named j6502. Name changed to lm6502.

src/main/java/com/loomcom/lm6502/Device.java

@@ -0,0 +1,40 @@
+ package com.loomcom.lm6502;
+
+/**
+ * A memory-mapped IO Device.
+ */
+
+public abstract class Device {
+
+	/** The memory range for this device. */
+	private MemoryRange m_memoryRange;
+
+	/** Reference to the CPU, for interrupts. */
+	private Cpu m_cpu;
+
+	public Device(MemoryRange range, Cpu cpu) {
+		m_memoryRange = range;
+		m_cpu = cpu;
+	}
+
+	public MemoryRange getMemoryRange() {
+		return m_memoryRange;
+	}
+
+	public int getEndAddress() {
+		return m_memoryRange.getEndAddress();
+	}
+
+	public int getStartAddress() {
+		return m_memoryRange.getStartAddress();
+	}
+
+	public void generateInterrupt() {
+		m_cpu.interrupt();
+	}
+
+	public void generateNonMaskableInterrupt() {
+		m_cpu.nmiInterrupt();
+	}
+
+}