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/**********************************************************************
Intel 8255A Programmable Peripheral Interface emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************
_____ _____
PA3 1 |* \_/ | 40 PA4
PA2 2 | | 39 PA5
PA1 3 | | 38 PA6
PA0 4 | | 37 PA7
_RD 5 | | 36 WR
_CS 6 | | 35 RESET
GND 7 | | 34 D0
A1 8 | | 33 D1
A0 9 | | 32 D2
PC7 10 | 8255A | 31 D3
PC6 11 | | 30 D4
PC5 12 | | 29 D5
PC4 13 | | 28 D6
PC0 14 | | 27 D7
PC1 15 | | 26 Vcc
PC2 16 | | 25 PB7
PC3 17 | | 24 PB6
PB0 18 | | 23 PB5
PB1 19 | | 22 PB4
PB2 20 |_____________| 21 PB3
**********************************************************************/
#ifndef __I8255A__
#define __I8255A__
#include "devlegcy.h"
/***************************************************************************
MACROS / CONSTANTS
***************************************************************************/
DECLARE_LEGACY_DEVICE(I8255A, i8255a);
#define MDRV_I8255A_ADD(_tag, _intrf) \
MDRV_DEVICE_ADD(_tag, I8255A, 0) \
MDRV_DEVICE_CONFIG(_intrf)
#define I8255A_INTERFACE(name) \
const i8255a_interface (name)=
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
typedef struct _i8255a_interface i8255a_interface;
struct _i8255a_interface
{
devcb_read8 in_pa_func;
devcb_read8 in_pb_func;
devcb_read8 in_pc_func;
devcb_write8 out_pa_func;
devcb_write8 out_pb_func;
devcb_write8 out_pc_func;
};
/***************************************************************************
PROTOTYPES
***************************************************************************/
/* register access */
READ8_DEVICE_HANDLER( i8255a_r );
WRITE8_DEVICE_HANDLER( i8255a_w );
/* port access */
READ8_DEVICE_HANDLER( i8255a_pa_r );
READ8_DEVICE_HANDLER( i8255a_pb_r );
/* handshaking signals */
WRITE_LINE_DEVICE_HANDLER( i8255a_pc2_w );
WRITE_LINE_DEVICE_HANDLER( i8255a_pc4_w );
WRITE_LINE_DEVICE_HANDLER( i8255a_pc6_w );
#endif
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