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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
i8243.h
Intel 8243 Input/Output Expander
****************************************************************************
_____ _____
P50 1 |* \_/ | 24 VCC
P40 2 | | 23 P51
P41 3 | | 22 P52
P42 4 | | 21 P53
P43 5 | | 20 P60
_CS 6 | | 19 P61
PROG 7 | 8243 | 18 P62
P23 8 | | 17 P63
P22 9 | | 16 P73
P21 10 | | 15 P72
P20 11 | | 14 P71
GND 12 |_____________| 13 P70
***************************************************************************/
#ifndef MAME_MACHINE_I8243_H
#define MAME_MACHINE_I8243_H
#pragma once
class i8243_device : public device_t
{
public:
// construction/destruction
i8243_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
// configuration helpers
auto p4_in_cb() { return m_readhandler[0].bind(); }
auto p4_out_cb() { return m_writehandler[0].bind(); }
auto p5_in_cb() { return m_readhandler[1].bind(); }
auto p5_out_cb() { return m_writehandler[1].bind(); }
auto p6_in_cb() { return m_readhandler[2].bind(); }
auto p6_out_cb() { return m_writehandler[2].bind(); }
auto p7_in_cb() { return m_readhandler[3].bind(); }
auto p7_out_cb() { return m_writehandler[3].bind(); }
uint8_t p2_r();
void p2_w(uint8_t data);
DECLARE_WRITE_LINE_MEMBER(prog_w);
DECLARE_WRITE_LINE_MEMBER(cs_w);
protected:
// device-level overrides
virtual void device_start() override;
private:
void output_update(int which);
uint8_t m_p[4]; // 4 ports' worth of data
uint8_t m_p2out; // port 2 bits that will be returned
uint8_t m_p2; // most recent port 2 value
uint8_t m_opcode; // latched opcode
bool m_prog; // previous PROG state
bool m_cs; // chip select
devcb_read8::array<4> m_readhandler;
devcb_write8::array<4> m_writehandler;
};
// device type definition
DECLARE_DEVICE_TYPE(I8243, i8243_device)
#endif // MAME_MACHINE_I8243_H
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