[NES] fix some input bugs

BizHawk.Emulation/CPUs/MOS 6502/Execute.cs

@@ -61,7 +61,7 @@ TriggerException(ExceptionType.BRK);
                         PendingCycles -= 5; TotalExecutedCycles += 5;
                         break;
                     case 0x08: // PHP
-                        //FlagB = true; //why would it do this?? how weird
+                        FlagB = true; //why would it do this?? how weird
                         WriteMemory((ushort)(S-- + 0x100), P);
                         PendingCycles -= 3; TotalExecutedCycles += 3;
                         break;

BizHawk.Emulation/Consoles/Nintendo/NES/APU.cs

@@ -418,7 +418,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 						return (byte)ret;
 					}
 					default:
-						return 0xFF;
+						return 0x00;
 				}
 			}