diff --git a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum48K/ZX48.cs b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum48K/ZX48.cs
index ffbc38c13c..57e5e14c1a 100644
--- a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum48K/ZX48.cs
+++ b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum48K/ZX48.cs
@@ -1,186 +1,196 @@
-using BizHawk.Emulation.Cores.Components.Z80A;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
-{
-    public class ZX48 : SpectrumBase
-    {
-        #region Construction
-
-        /// <summary>
-        /// Main constructor
-        /// </summary>
-        /// <param name="spectrum"></param>
-        /// <param name="cpu"></param>
-        public ZX48(ZXSpectrum spectrum, Z80A cpu, byte[] file)
-        {
-            Spectrum = spectrum;
-            CPU = cpu;
-
-            // init addressable memory from ROM and RAM banks
-            /*
-            Memory.Add(0, ROM0);
-            Memory.Add(1, RAM0);
-            Memory.Add(2, RAM1);
-            Memory.Add(3, RAM2);
-            */
-            ReInitMemory();
-
-            //RAM = new byte[0x4000 + 0xC000];
-
-            InitScreenConfig();
-            InitScreen();
-
-            ResetULACycle();
-
-            BuzzerDevice = new Buzzer(this);
-            BuzzerDevice.Init(44100, UlaFrameCycleCount);
-
-            KeyboardDevice = new Keyboard48(this);
-
-            TapeProvider = new DefaultTapeProvider(file);
-
-            TapeDevice = new Tape(TapeProvider);
-            TapeDevice.Init(this);
-        }
-
-        #endregion
-
-        #region MemoryMapping
-
-        /* 48K Spectrum has NO memory paging
-         * 
-         *  0xffff +--------+
-                   | Bank 2 |
-                   |        |
-                   |        |
-                   |        |
-            0xc000 +--------+
-                   | Bank 1 |
-                   |        |
-                   |        |
-                   |        |
-            0x8000 +--------+
-                   | Bank 0 |
-                   |        |
-                   |        |
-                   | screen |
-            0x4000 +--------+
-                   | ROM 0  |
-                   |        |
-                   |        |
-                   |        |
-            0x0000 +--------+
-        */
-
-        /// <summary>
-        /// Simulates reading from the bus (no contention)
-        /// Paging should be handled here
-        /// </summary>
-        /// <param name="addr"></param>
-        /// <returns></returns>
-        public override byte ReadBus(ushort addr)
-        {
-            int divisor = addr / 0x4000;
-            // paging logic goes here
-
-            var bank = Memory[divisor];
-            var index = addr % 0x4000;
-            return bank[index];
-        }
-
-        /// <summary>
-        /// Simulates writing to the bus (no contention)
-        /// Paging should be handled here
-        /// </summary>
-        /// <param name="addr"></param>
-        /// <param name="value"></param>
-        public override void WriteBus(ushort addr, byte value)
-        {
-            int divisor = addr / 0x4000;
-            // paging logic goes here
-
-            var bank = Memory[divisor];
-            var index = addr % 0x4000;
-            bank[index] = value;
-        }
-
-        /// <summary>
-        /// Reads a byte of data from a specified memory address
-        /// (with memory contention if appropriate)
-        /// </summary>
-        /// <param name="addr"></param>
-        /// <returns></returns>
-        public override byte ReadMemory(ushort addr)
-        {
-            var data = ReadBus(addr);
-            if ((addr & 0xC000) == 0x4000)
-            {
-                // addr is in RAM not ROM - apply memory contention if neccessary
-                var delay = GetContentionValue(CurrentFrameCycle);
-                CPU.TotalExecutedCycles += delay;
-            }
-            return data;
-        }
-
-        /// <summary>
-        /// Writes a byte of data to a specified memory address
-        /// (with memory contention if appropriate)
-        /// </summary>
-        /// <param name="addr"></param>
-        /// <param name="value"></param>
-        public override void WriteMemory(ushort addr, byte value)
-        {
-            if (addr < 0x4000)
-            {
-                // Do nothing - we cannot write to ROM
-                return;
-            }
-            else if (addr < 0xC000)
-            {
-                // possible contended RAM
-                var delay = GetContentionValue(CurrentFrameCycle);
-                CPU.TotalExecutedCycles += delay;
-            }
-
-            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] = RAM0;
-            else
-                Memory.Add(1, RAM0);
-
-            if (Memory.ContainsKey(2))
-                Memory[2] = RAM1;
-            else
-                Memory.Add(2, RAM1);
-
-            if (Memory.ContainsKey(3))
-                Memory[3] = RAM2;
-            else
-                Memory.Add(3, RAM2);
-
-            if (Memory.ContainsKey(4))
-                Memory[4] = RAM3;
-            else
-                Memory.Add(4, RAM3);
-        }
-
-
-        #endregion
-
-
-    }
-}
+using BizHawk.Emulation.Cores.Components.Z80A;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
+{
+    public class ZX48 : SpectrumBase
+    {
+        #region Construction
+
+        /// <summary>
+        /// Main constructor
+        /// </summary>
+        /// <param name="spectrum"></param>
+        /// <param name="cpu"></param>
+        public ZX48(ZXSpectrum spectrum, Z80A cpu, byte[] file)
+        {
+            Spectrum = spectrum;
+            CPU = cpu;
+
+            // init addressable memory from ROM and RAM banks
+            /*
+            Memory.Add(0, ROM0);
+            Memory.Add(1, RAM0);
+            Memory.Add(2, RAM1);
+            Memory.Add(3, RAM2);
+            */
+            ReInitMemory();
+
+            //RAM = new byte[0x4000 + 0xC000];
+
+            InitScreenConfig();
+            InitScreen();
+
+            ResetULACycle();
+
+            BuzzerDevice = new Buzzer(this);
+            BuzzerDevice.Init(44100, UlaFrameCycleCount);
+
+            KeyboardDevice = new Keyboard48(this);
+
+            TapeProvider = new DefaultTapeProvider(file);
+
+            TapeDevice = new Tape(TapeProvider);
+            TapeDevice.Init(this);
+        }
+
+        #endregion
+
+        #region MemoryMapping
+
+        /* 48K Spectrum has NO memory paging
+         * 
+         *  0xffff +--------+
+                   | Bank 2 |
+                   |        |
+                   |        |
+                   |        |
+            0xc000 +--------+
+                   | Bank 1 |
+                   |        |
+                   |        |
+                   |        |
+            0x8000 +--------+
+                   | Bank 0 |
+                   |        |
+                   |        |
+                   | screen |
+            0x4000 +--------+
+                   | ROM 0  |
+                   |        |
+                   |        |
+                   |        |
+            0x0000 +--------+
+        */
+
+        /// <summary>
+        /// Simulates reading from the bus (no contention)
+        /// Paging should be handled here
+        /// </summary>
+        /// <param name="addr"></param>
+        /// <returns></returns>
+        public override byte ReadBus(ushort addr)
+        {
+            int divisor = addr / 0x4000;
+            // paging logic goes here
+
+            var bank = Memory[divisor];
+            var index = addr % 0x4000;
+            return bank[index];
+        }
+
+		/// <summary>
+		///  Pushes a value onto the data bus that should be valid as long as the interrupt is true
+		/// </summary>
+		/// <param name="addr"></param>
+		/// <returns></returns>
+		public override byte PushBus()
+		{
+			return 0xFF;
+		}
+
+		/// <summary>
+		/// Simulates writing to the bus (no contention)
+		/// Paging should be handled here
+		/// </summary>
+		/// <param name="addr"></param>
+		/// <param name="value"></param>
+		public override void WriteBus(ushort addr, byte value)
+        {
+            int divisor = addr / 0x4000;
+            // paging logic goes here
+
+            var bank = Memory[divisor];
+            var index = addr % 0x4000;
+            bank[index] = value;
+        }
+
+        /// <summary>
+        /// Reads a byte of data from a specified memory address
+        /// (with memory contention if appropriate)
+        /// </summary>
+        /// <param name="addr"></param>
+        /// <returns></returns>
+        public override byte ReadMemory(ushort addr)
+        {
+            var data = ReadBus(addr);
+            if ((addr & 0xC000) == 0x4000)
+            {
+                // addr is in RAM not ROM - apply memory contention if neccessary
+                var delay = GetContentionValue(CurrentFrameCycle);
+                CPU.TotalExecutedCycles += delay;
+            }
+            return data;
+        }
+
+        /// <summary>
+        /// Writes a byte of data to a specified memory address
+        /// (with memory contention if appropriate)
+        /// </summary>
+        /// <param name="addr"></param>
+        /// <param name="value"></param>
+        public override void WriteMemory(ushort addr, byte value)
+        {
+            if (addr < 0x4000)
+            {
+                // Do nothing - we cannot write to ROM
+                return;
+            }
+            else if (addr < 0xC000)
+            {
+                // possible contended RAM
+                var delay = GetContentionValue(CurrentFrameCycle);
+                CPU.TotalExecutedCycles += delay;
+            }
+
+            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] = RAM0;
+            else
+                Memory.Add(1, RAM0);
+
+            if (Memory.ContainsKey(2))
+                Memory[2] = RAM1;
+            else
+                Memory.Add(2, RAM1);
+
+            if (Memory.ContainsKey(3))
+                Memory[3] = RAM2;
+            else
+                Memory.Add(3, RAM2);
+
+            if (Memory.ContainsKey(4))
+                Memory[4] = RAM3;
+            else
+                Memory.Add(4, RAM3);
+        }
+
+
+        #endregion
+
+
+    }
+}