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diff --git a/trunk/src/emu/machine/adc0808.h b/trunk/src/emu/machine/adc0808.h
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+/**********************************************************************
+
+ National Semiconductor ADC0808/ADC0809 8-Bit A/D Converter emulation
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************
+ _____ _____
+ IN3 1 |* \_/ | 28 IN2
+ IN4 2 | | 27 IN1
+ IN5 3 | | 26 IN0
+ IN6 4 | | 25 ADD A
+ IN7 5 | | 24 ADD B
+ START 6 | | 23 ADD C
+ EOC 7 | ADC0808 | 22 ALE
+ 2-5 8 | ADC0809 | 21 2-1 MSB
+ OUTPUT ENABLE 9 | | 20 2-2
+ CLOCK 10 | | 19 2-3
+ Vcc 11 | | 18 2-4
+ Vref+ 12 | | 17 2-8 LSB
+ GND 13 | | 16 Vref-
+ 2-7 14 |_____________| 15 2-6
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __ADC0808__
+#define __ADC0808__
+
+#include "emu.h"
+
+
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_ADC0808_ADD(_tag, _clock, _config) \
+ MCFG_DEVICE_ADD(_tag, ADC0808, _clock) \
+ MCFG_DEVICE_CONFIG(_config)
+
+
+#define ADC0808_INTERFACE(name) \
+ const adc0808_interface (name) =
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> adc0808_analog_read
+
+typedef double (*adc0808_analog_read) (device_t *device);
+#define ADC0808_ANALOG_READ(name) double name(device_t *device)
+
+
+// ======================> adc0808_interface
+
+struct adc0808_interface
+{
+ devcb_write_line m_out_eoc_cb;
+
+ adc0808_analog_read m_in_vref_pos_func;
+ adc0808_analog_read m_in_vref_neg_func;
+
+ adc0808_analog_read m_in_in_func[8];
+};
+
+
+// ======================> adc0808_device
+
+class adc0808_device : public device_t,
+ public adc0808_interface
+{
+public:
+ // construction/destruction
+ adc0808_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ DECLARE_READ8_MEMBER( data_r );
+ DECLARE_WRITE8_MEMBER( ale_w );
+
+ DECLARE_WRITE_LINE_MEMBER( start_w );
+
+protected:
+ // device-level overrides
+ virtual void device_config_complete();
+ virtual void device_start();
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
+
+private:
+ devcb_resolved_write_line m_out_eoc_func;
+
+ int m_address; // analog channel address
+ int m_start; // start conversion pin
+ int m_eoc; // end of conversion pin
+ int m_next_eoc; // next value end of conversion pin
+
+ UINT8 m_sar; // successive approximation register
+
+ int m_cycle; // clock cycle counter
+ int m_bit; // bit counter
+
+ // timers
+ emu_timer *m_cycle_timer;
+};
+
+
+// device type definition
+extern const device_type ADC0808;
+
+
+
+#endif