New cpu

src/cpu6502.d

@@ -0,0 +1,45 @@
+module cpu6502;
+
+
+enum Strict : bool
+{
+    no, yes
+}
+
+enum Cumulative : bool
+{
+    no, yes
+}
+
+
+class Cpu(bool cumulative)
+{
+    struct _Mem
+    {
+        // Reads a value from system memory.
+        ubyte delegate(ushort addr) read;
+
+        // Writes a value to system memory.
+        void delegate(ushort addr, ubyte val) write;
+    }
+    _Mem memory;
+
+    struct _Clock
+    {
+        static if (cumulative)
+            /*
+             * Updates the number of cycles executed. Called just
+             * prior to the final read/write action of each opcode.
+             */
+            void delegate(int cycles) tick;
+        else
+            /*
+             * Increments the number of cycles executed. Called prior
+             * to each read/write action.
+             */
+            void delegate() tick;
+    }
+    _Clock clock;
+
+    ubyte A, X, Y, S, P;
+}