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diff --git a/src/mess/includes/electron.h b/src/mess/includes/electron.h
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+/*****************************************************************************
+ *
+ * includes/electron.h
+ *
+ * Acorn Electron
+ *
+ * Driver by Wilbert Pol
+ *
+ ****************************************************************************/
+
+#ifndef ELECTRON_H_
+#define ELECTRON_H_
+
+
+/* Interrupts */
+#define INT_HIGH_TONE 0x40
+#define INT_TRANSMIT_EMPTY 0x20
+#define INT_RECEIVE_FULL 0x10
+#define INT_RTC 0x08
+#define INT_DISPLAY_END 0x04
+#define INT_SET 0x100
+#define INT_CLEAR 0x200
+
+/* ULA context */
+
+typedef struct
+{
+ UINT8 interrupt_status;
+ UINT8 interrupt_control;
+ UINT8 rompage;
+ UINT16 screen_start;
+ UINT16 screen_base;
+ int screen_size;
+ UINT16 screen_addr;
+ UINT8 *vram;
+ int current_pal[16];
+ int communication_mode;
+ int screen_mode;
+ int cassette_motor_mode;
+ int capslock_mode;
+// int scanline;
+ /* tape reading related */
+ UINT32 tape_value;
+ int tape_steps;
+ int bit_count;
+ int high_tone_set;
+ int start_bit;
+ int stop_bit;
+ int tape_running;
+ UINT8 tape_byte;
+} ULA;
+
+
+class electron_state : public driver_device
+{
+public:
+ electron_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag) { }
+
+ ULA m_ula;
+ emu_timer *m_tape_timer;
+ int m_map4[256];
+ int m_map16[256];
+ emu_timer *m_scanline_timer;
+ DECLARE_READ8_MEMBER(electron_read_keyboard);
+ DECLARE_READ8_MEMBER(electron_jim_r);
+ DECLARE_WRITE8_MEMBER(electron_jim_w);
+ DECLARE_READ8_MEMBER(electron_1mhz_r);
+ DECLARE_WRITE8_MEMBER(electron_1mhz_w);
+ DECLARE_READ8_MEMBER(electron_ula_r);
+ DECLARE_WRITE8_MEMBER(electron_ula_w);
+ void electron_tape_start();
+ void electron_tape_stop();
+};
+
+
+/*----------- defined in machine/electron.c -----------*/
+
+MACHINE_START( electron );
+
+void electron_interrupt_handler(running_machine &machine, int mode, int interrupt);
+
+
+/*----------- defined in video/electron.c -----------*/
+
+VIDEO_START( electron );
+SCREEN_UPDATE_IND16( electron );
+
+
+#endif /* ELECTRON_H_ */