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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
Intel 8355 - 16,384-Bit ROM with I/O emulation
**********************************************************************
_____ _____
_CE1 1 |* \_/ | 40 Vcc
CE2 2 | | 39 PB7
CLK 3 | | 38 PB6
RESET 4 | | 37 PB5
N.C. 5 | | 36 PB4
READY 6 | | 35 PB3
IO/_M 7 | | 34 PB2
_IOR 8 | | 33 PB1
_RD 9 | | 32 PB0
_IOW 10 | 8355 | 31 PA7
ALE 11 | 8355-2 | 30 PA6
AD0 12 | | 29 PA5
AD1 13 | | 28 PA4
AD2 14 | | 27 PA3
AD3 15 | | 26 PA2
AD4 16 | | 25 PA1
AD5 17 | | 24 PA0
AD6 18 | | 23 A10
AD7 19 | | 22 A9
Vss 20 |_____________| 21 A8
**********************************************************************/
#ifndef MAME_MACHINE_I8355_H
#define MAME_MACHINE_I8355_H
#pragma once
class i8355_device : public device_t
{
public:
// construction/destruction
i8355_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock);
auto in_pa() { return m_in_pa_cb.bind(); }
auto out_pa() { return m_out_pa_cb.bind(); }
auto in_pb() { return m_in_pb_cb.bind(); }
auto out_pb() { return m_out_pb_cb.bind(); }
u8 io_r(offs_t offset);
void io_w(offs_t offset, u8 data);
u8 memory_r(offs_t offset);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
inline uint8_t read_port(int port);
inline void write_port(int port, uint8_t data);
private:
devcb_read8 m_in_pa_cb;
devcb_write8 m_out_pa_cb;
devcb_read8 m_in_pb_cb;
devcb_write8 m_out_pb_cb;
// registers
uint8_t m_output[2]; // output latches
uint8_t m_ddr[2]; // DDR latches
// internal ROM
required_region_ptr<uint8_t> m_rom;
};
// device type definition
DECLARE_DEVICE_TYPE(I8355, i8355_device)
#endif // MAME_MACHINE_I8355_H
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