Built basic debugger UI and execution framework; a few bugfixes. CPU now executes uCode up until the first STARTF (unimplemented).

Contralto/AltoSystem.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+using Contralto.CPU;
+using Contralto.Memory;
+
+namespace Contralto
+{
+    /// <summary>
+    /// Encapsulates all Alto hardware; represents a complete Alto system.
+    /// Provides interfaces for controlling and debugging the system externally.
+    /// </summary>
+    public class AltoSystem
+    {
+        public AltoSystem()
+        {
+            _cpu = new AltoCPU(this);
+            _mem = new MemoryBus();
+            Reset();
+        }
+
+        public void Reset()
+        {
+            _cpu.Reset();
+            _mem.Reset();
+        }
+
+        public void SingleStep()
+        {            
+            _mem.Clock();            
+            _cpu.ExecuteNext();            
+        }
+
+        public AltoCPU CPU
+        {
+            get { return _cpu; }
+        }
+
+        public MemoryBus MemoryBus
+        {
+            get { return _mem; }
+        }
+
+        private AltoCPU _cpu;
+        private MemoryBus _mem;
+    }
+}