Baby steps

modules/pcjs/lib/defines.js

@@ -106,6 +106,16 @@ var BACKTRACK = !COMPILED;
  */
 var SAMPLER = false;
 
+/**
+ * @define {boolean}
+ *
+ * Enables support for known 8086 bugs.  It's turned off by default, because 1) it adds overhead, and 2) it's
+ * hard to imagine any software actually being dependent on any of the bugs covered by this (eg, the failure to
+ * properly restart string instructions with multiple prefixes, or the failure to inhibit hardware interrupts
+ * following SS segment loads).
+ */
+var BUGS_8086 = false;
+
 /**
  * @define {boolean}
  *