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diff --git a/trunk/src/emu/machine/ins8154.h b/trunk/src/emu/machine/ins8154.h
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+/***************************************************************************
+
+ National Semiconductor INS8154
+
+ N-Channel 128-by-8 Bit RAM Input/Output (RAM I/O)
+
+ _____ _____
+ PB6 1 |* \_/ | 40 VCC
+ PB5 2 | | 39 PB7
+ PB4 3 | | 38 NWDS
+ PB3 4 | | 37 NRDS
+ PB2 5 | | 36 NRST
+ PB1 6 | | 35 _CS0
+ PB0 7 | | 34 CS1
+ DB7 8 | | 33 M/_IO
+ DB6 9 | | 32 AD6
+ DB5 10 | INS8154 | 31 AD5
+ DB4 11 | | 30 AD4
+ DB3 12 | | 29 AD3
+ DB2 13 | | 28 AD2
+ DB1 14 | | 27 AD1
+ DB0 15 | | 26 AD0
+ PA7 16 | | 25 INTR
+ PA6 17 | | 24 PA0
+ PA5 18 | | 23 PA1
+ PA4 19 | | 22 PA2
+ GND 20 |_____________| 21 PA3
+
+***************************************************************************/
+
+#pragma once
+
+#ifndef __INS8154_H__
+#define __INS8154_H__
+
+#include "emu.h"
+
+
+
+/***************************************************************************
+ DEVICE CONFIGURATION MACROS
+***************************************************************************/
+
+#define MCFG_INS8154_ADD(_tag, _intrf) \
+ MCFG_DEVICE_ADD(_tag, INS8154, 0) \
+ MCFG_DEVICE_CONFIG(_intrf)
+
+
+/***************************************************************************
+ TYPE DEFINITIONS
+***************************************************************************/
+
+
+// ======================> ins8154_interface
+
+struct ins8154_interface
+{
+ devcb_read8 m_in_a_cb;
+ devcb_write8 m_out_a_cb;
+ devcb_read8 m_in_b_cb;
+ devcb_write8 m_out_b_cb;
+ devcb_write_line m_out_irq_cb;
+};
+
+
+
+// ======================> ins8154_device
+
+class ins8154_device : public device_t,
+ public ins8154_interface
+{
+public:
+ // construction/destruction
+ ins8154_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ UINT8 ins8154_r(UINT32 offset);
+ void ins8154_w(UINT32 offset, UINT8 data);
+
+ void ins8154_porta_w(UINT32 offset, UINT8 data);
+ void ins8154_portb_w(UINT32 offset, UINT8 data);
+
+protected:
+ // device-level overrides
+ virtual void device_config_complete();
+ virtual void device_start();
+ virtual void device_reset();
+ virtual void device_post_load() { }
+ virtual void device_clock_changed() { }
+
+private:
+
+ /* i/o lines */
+ devcb_resolved_read8 m_in_a_func;
+ devcb_resolved_write8 m_out_a_func;
+ devcb_resolved_read8 m_in_b_func;
+ devcb_resolved_write8 m_out_b_func;
+ devcb_resolved_write_line m_out_irq_func;
+
+ /* registers */
+ UINT8 m_in_a; /* Input Latch Port A */
+ UINT8 m_in_b; /* Input Latch Port B */
+ UINT8 m_out_a; /* Output Latch Port A */
+ UINT8 m_out_b; /* Output Latch Port B */
+ UINT8 m_mdr; /* Mode Definition Register */
+ UINT8 m_odra; /* Output Definition Register Port A */
+ UINT8 m_odrb; /* Output Definition Register Port B */
+};
+
+
+// device type definition
+extern const device_type INS8154;
+
+
+
+/***************************************************************************
+ PROTOTYPES
+***************************************************************************/
+
+READ8_DEVICE_HANDLER( ins8154_r );
+WRITE8_DEVICE_HANDLER( ins8154_w );
+
+WRITE8_DEVICE_HANDLER( ins8154_porta_w );
+WRITE8_DEVICE_HANDLER( ins8154_portb_w );
+
+
+#endif /* __INS8154_H__ */