ZXHawk: Removed IO port contention for now (this fixes the slow beeper music problem). Will re-implement properly later - #1158

BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/SpectrumBase.Port.cs

@@ -52,6 +52,8 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
         /// <param name="addr"></param>
         public virtual void ContendPortAddress(ushort addr)
         {
+            return;
+
             /*
             It takes four T states for the Z80 to read a value from an I/O port, or write a value to a port. As is the case with memory access, 
             this can be lengthened by the ULA. There are two effects which occur here:

BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum128KPlus2a/ZX128Plus2a.Port.cs

@@ -287,7 +287,7 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
         /// <param name="addr"></param>
         public override void ContendPortAddress(ushort addr)
         {
-            CPU.TotalExecutedCycles += 4;
+            //CPU.TotalExecutedCycles += 4;
         }
     }
 }

BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum128KPlus3/ZX128Plus3.Port.cs

@@ -220,7 +220,7 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
         /// <param name="addr"></param>
         public override void ContendPortAddress(ushort addr)
         {
-            CPU.TotalExecutedCycles += 4;
+            //CPU.TotalExecutedCycles += 4;
         }
     }
 }