More illegal opcode fixes.

Author: ooPo

src/MOS6502_illegal.cpp

@@ -145,20 +145,18 @@ void MOS6502::RunIllegal(BYTE opcode) {
     }
 
     // ---------------------------------------------------------------
-    // ANE / XAA — A = (A | magic) & X & #imm  (unstable on hardware)
-    // LXA       — A = X = (A | magic) & #imm  (unstable on hardware)
-    // The "magic" constant varies by die/temperature; 0xEE is the value
-    // Blargg's test ROMs assume.
+    // ANE / XAA  (0x8B) — A = X & #imm
+    // LXA / ATX  (0xAB) — A = X = #imm
     // ---------------------------------------------------------------
 
     case 0x8B:
       PollInterrupts();
-      A = Flags((A | 0xEE) & X & Fetch());
+      A = Flags(X & Fetch());
       break;
 
     case 0xAB:
       PollInterrupts();
-      A = X = Flags((A | 0xEE) & Fetch());
+      A = X = Flags(Fetch());
       break;
 
     // ---------------------------------------------------------------