Add last key, strobe fields

include/apple2.h

@@ -304,6 +304,15 @@ typedef struct {
      */
     vm_8bit memory_mode;
 
+    /*
+     * The last_key field is the ASCII value of the last key that was
+     * pressed. We also have a simple boolean value to determine if the
+     * strobe is set (it always is when the key is pressed, and stays
+     * that way until someone reads the "any-key-down" soft switch).
+     */
+    vm_8bit last_key;
+    bool strobe;
+
     /*
      * Our two disk drives.
      */