diff --git a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/SpectrumBase.Memory.cs b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/SpectrumBase.Memory.cs
index e625ecae77..5a21a8db42 100644
--- a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/SpectrumBase.Memory.cs
+++ b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/SpectrumBase.Memory.cs
@@ -32,12 +32,6 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
         public byte[] RAM6 = new byte[0x4000];  // Bank 6
         public byte[] RAM7 = new byte[0x4000];  // Bank 7
 
-        /// <summary>
-        /// Represents the addressable memory space of the spectrum
-        /// All banks for the emulated system should be added during initialisation
-        /// </summary>
-        public Dictionary<int, byte[]> Memory = new Dictionary<int, byte[]>();
-
         /// <summary>
         /// Simulates reading from the bus
         /// Paging should be handled here
diff --git a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum16K/ZX16.cs b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum16K/ZX16.cs
index 7d79f80544..f310b9f7de 100644
--- a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum16K/ZX16.cs
+++ b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum16K/ZX16.cs
@@ -51,17 +51,18 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
         public override byte ReadBus(ushort addr)
         {
             int divisor = addr / 0x4000;
+            var index = addr % 0x4000;
+
             // paging logic goes here
 
-            if (divisor > 1)
+            switch (divisor)
             {
-                // memory does not exist
-                return 0xff;
+                case 0: return ROM0[index];
+                case 1: return RAM0[index];
+                default:
+                    // memory does not exist
+                    return 0xff;
             }
-
-            var bank = Memory[divisor];
-            var index = addr % 0x4000;
-            return bank[index];
         }
 
         /// <summary>
@@ -73,17 +74,23 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
         public override void WriteBus(ushort addr, byte value)
         {
             int divisor = addr / 0x4000;
+            var index = addr % 0x4000;
+
             // paging logic goes here
 
-            if (divisor > 1)
+            switch (divisor)
             {
-                // memory does not exist
-                return;
+                case 0:
+                    // cannot write to ROM
+                    break;
+                case 1:
+                    RAM0[index] = value;
+                    break;
             }
 
-            var bank = Memory[divisor];
-            var index = addr % 0x4000;
-            bank[index] = value;
+            // update ULA screen buffer if necessary
+            if ((addr & 49152) == 16384 && _render)
+                ULADevice.UpdateScreenBuffer(CurrentFrameCycle);            
         }
 
         /// <summary>
@@ -97,8 +104,6 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
             if (ULADevice.IsContended(addr))
                 CPU.TotalExecutedCycles += ULADevice.contentionTable[CurrentFrameCycle];
 
-            CPU.TotalExecutedCycles += 3;
-
             var data = ReadBus(addr);
             return data;
         }
@@ -115,25 +120,9 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
             if (ULADevice.IsContended(addr))
                 CPU.TotalExecutedCycles += ULADevice.contentionTable[CurrentFrameCycle];
 
-            CPU.TotalExecutedCycles += 3;
-
             WriteBus(addr, value);
         }
-        /*
-        public override void ReInitMemory()
-        {
-            if (Memory.ContainsKey(0))
-                Memory[0] = ROM0;
-            else
-                Memory.Add(0, ROM0);
-
-            if (Memory.ContainsKey(1))
-                Memory[1] = RAM1;
-            else
-                Memory.Add(1, RAM1);            
-        }
-        */
-
+        
         /// <summary>
         /// Sets up the ROM
         /// </summary>
diff --git a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum48K/ZX48.Memory.cs b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum48K/ZX48.Memory.cs
index 8b9427d66b..bef6b97317 100644
--- a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum48K/ZX48.Memory.cs
+++ b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum48K/ZX48.Memory.cs
@@ -99,8 +99,7 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
         public override byte ReadMemory(ushort addr)
         {
             if (ULADevice.IsContended(addr))
-                CPU.TotalExecutedCycles += ULADevice.contentionTable[CurrentFrameCycle];
-            
+                CPU.TotalExecutedCycles += ULADevice.contentionTable[CurrentFrameCycle];            
 
             var data = ReadBus(addr);
             return data;
diff --git a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/ZXSpectrum.cs b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/ZXSpectrum.cs
index bb116f8922..cb294a8146 100644
--- a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/ZXSpectrum.cs
+++ b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/ZXSpectrum.cs
@@ -16,7 +16,7 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
         isPorted: false,
         isReleased: false)]
     [ServiceNotApplicable(typeof(IDriveLight))]
-    public partial class ZXSpectrum : IDebuggable, IInputPollable, IStatable, IRegionable
+    public partial class ZXSpectrum : IRegionable
     {
         public ZXSpectrum(CoreComm comm, IEnumerable<byte[]> files, List<GameInfo> game, object settings, object syncSettings)
         {            
@@ -85,8 +85,8 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
             
             _cpu.MemoryCallbacks = MemoryCallbacks;
 
-            //HardReset = _machine.HardReset;
-            //SoftReset = _machine.SoftReset;
+            HardReset = _machine.HardReset;
+            SoftReset = _machine.SoftReset;
 
             _cpu.FetchMemory = _machine.ReadMemory;
             _cpu.ReadMemory = _machine.ReadMemory;
@@ -102,19 +102,17 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
             SoundMixer = new SoundProviderMixer((ISoundProvider)_machine.BuzzerDevice);
             if (_machine.AYDevice != null)
                 SoundMixer.AddSource(_machine.AYDevice);
-
-            //dcf = new DCFilter(SoundMixer, 256);
+            
             ser.Register<ISoundProvider>(SoundMixer);
-
             
 
-            //HardReset();
+            HardReset();
 
 			SetupMemoryDomains();
         }
                 
-        //public Action HardReset;
-        //public Action SoftReset;
+        public Action HardReset;
+        public Action SoftReset;
 
         private readonly Z80A _cpu;
         private readonly TraceBuffer _tracer;
@@ -123,11 +121,8 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
 
         private List<GameInfo> _gameInfo;
 
-        private SoundProviderMixer SoundMixer;
-
-        private DCFilter dcf;
-
-        //private byte[] _file;
+        private SoundProviderMixer SoundMixer;        
+        
         private readonly List<byte[]> _files;
 
         public bool DiagRom = false;