// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** Intel 8155/8156 - 2048-Bit Static MOS RAM with I/O Ports and Timer ********************************************************************** _____ _____ PC3 1 |* \_/ | 40 Vcc PC4 2 | | 39 PC2 TIMER IN 3 | | 38 PC1 RESET 4 | | 37 PC0 PC5 5 | | 36 PB7 _TIMER OUT 6 | | 35 PB6 IO/_M 7 | | 34 PB5 CE or _CE 8 | | 33 PB4 _RD 9 | | 32 PB3 _WR 10 | 8155 | 31 PB2 ALE 11 | 8156 | 30 PB1 AD0 12 | | 29 PB0 AD1 13 | | 28 PA7 AD2 14 | | 27 PA6 AD3 15 | | 26 PA5 AD4 16 | | 25 PA4 AD5 17 | | 24 PA3 AD6 18 | | 23 PA2 AD7 19 | | 22 PA1 Vss 20 |_____________| 21 PA0 **********************************************************************/ #ifndef MAME_MACHINE_I8155_H #define MAME_MACHINE_I8155_H #pragma once //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> i8155_device class i8155_device : public device_t { public: // construction/destruction i8155_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); auto in_pa_callback() { return m_in_pa_cb.bind(); } auto in_pb_callback() { return m_in_pb_cb.bind(); } auto in_pc_callback() { return m_in_pc_cb.bind(); } auto out_pa_callback() { return m_out_pa_cb.bind(); } auto out_pb_callback() { return m_out_pb_cb.bind(); } auto out_pc_callback() { return m_out_pc_cb.bind(); } auto out_to_callback() { return m_out_to_cb.bind(); } uint8_t io_r(offs_t offset); void io_w(offs_t offset, uint8_t data); uint8_t memory_r(offs_t offset); void memory_w(offs_t offset, uint8_t data); void ale_w(offs_t offset, uint8_t data); uint8_t data_r(); void data_w(uint8_t data); protected: i8155_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock); // device-level overrides virtual void device_start() override; virtual void device_reset() override; virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override; private: devcb_read8 m_in_pa_cb; devcb_read8 m_in_pb_cb; devcb_read8 m_in_pc_cb; devcb_write8 m_out_pa_cb; devcb_write8 m_out_pb_cb; devcb_write8 m_out_pc_cb; // this gets called for each change of the TIMER OUT pin (pin 6) devcb_write_line m_out_to_cb; // CPU interface int m_io_m; // I/O or memory select uint8_t m_ad; // address // registers uint8_t m_command; // command register uint8_t m_status; // status register uint8_t m_output[3]; // output latches // RAM std::unique_ptr m_ram; // counter uint16_t m_count_length; // count length register (assigned) uint16_t m_count_loaded; // count length register (loaded) uint16_t m_counter; // counter register bool m_count_extra; // extra cycle when count is odd int m_to; // timer output // timers emu_timer *m_timer; // counter timer const address_space_config m_space_config; inline uint8_t get_timer_mode(); inline void timer_output(int to); inline void timer_stop_count(); inline void timer_reload_count(); inline int get_port_mode(int port); inline uint8_t read_port(int port); inline void write_port(int port, uint8_t data); void write_command(uint8_t data); void register_w(int offset, uint8_t data); }; class i8156_device : public i8155_device { public: // construction/destruction i8156_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); }; // device type definition DECLARE_DEVICE_TYPE(I8155, i8155_device) DECLARE_DEVICE_TYPE(I8156, i8156_device) #endif