Added MS-DOS 1.x and 2.0 directory listings (and fixed improper fault handling on 8086 machines)

modules/pcjs/lib/x86func.js

@@ -3776,6 +3776,18 @@ X86.fnXORw = function(dst, src)
  */
 X86.fnGRPFault = function(dst, src)
 {
+    /*
+     * This should NEVER be called on 8086/8088 CPUs, and yet we preset some of the handlers in aOpGrpPOPw,
+     * aOpGrp4b, and aOpGrp4w to call it.  initProcessor() DOES patch aOpGrp4b[0x07] and aOpGrp4w[0x07] to
+     * fnGRPInvalid, but that's it.
+     *
+     * However, given the infrequency of this call, it's simpler to continue presetting all the handlers in
+     * aOpGrpPOPw to their post-8086 default, and deal with the appropriate 8086 behavior here (which for now,
+     * is to call fnGRPUndefined instead).
+     */
+    if (this.model < X86.MODEL_80186) {
+        return X86.fnGRPUndefined.call(this, dst, src);
+    }
     X86.fnFault.call(this, X86.EXCEPTION.GP_FAULT, 0);
     return dst;
 };