// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** RCA CDP1871 Keyboard Encoder emulation ********************************************************************** _____ _____ D1 1 |* \_/ | 40 Vdd D2 2 | | 39 SHIFT D3 3 | | 38 CONTROL D4 4 | | 37 ALPHA D5 5 | | 36 DEBOUNCE D6 6 | | 35 _RPT D7 7 | | 34 TPB D8 8 | | 33 _DA D9 9 | | 32 BUS 7 D10 10 | CDP1871 | 31 BUS 6 D11 11 | | 30 BUS 5 S1 12 | | 29 BUS 4 S2 13 | | 28 BUS 3 S3 14 | | 27 BUS 2 S4 15 | | 26 BUS 1 S5 16 | | 25 BUS 0 S6 17 | | 24 CS4 S7 18 | | 23 CS3 S8 19 | | 22 CS2 Vss 20 |_____________| 21 _CS1 **********************************************************************/ #ifndef MAME_MACHINE_CDP1871_H #define MAME_MACHINE_CDP1871_H #pragma once class cdp1871_device : public device_t { public: // construction/destruction cdp1871_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); auto d1_callback() { return m_read_d1.bind(); } auto d2_callback() { return m_read_d2.bind(); } auto d3_callback() { return m_read_d3.bind(); } auto d4_callback() { return m_read_d4.bind(); } auto d5_callback() { return m_read_d5.bind(); } auto d6_callback() { return m_read_d6.bind(); } auto d7_callback() { return m_read_d7.bind(); } auto d8_callback() { return m_read_d8.bind(); } auto d9_callback() { return m_read_d9.bind(); } auto d10_callback() { return m_read_d10.bind(); } auto d11_callback() { return m_read_d11.bind(); } auto da_callback() { return m_write_da.bind(); } auto rpt_callback() { return m_write_rpt.bind(); } DECLARE_READ8_MEMBER( read ); DECLARE_READ_LINE_MEMBER( da_r ) { return m_da; } DECLARE_READ_LINE_MEMBER( rpt_r ) { return m_rpt; } DECLARE_WRITE_LINE_MEMBER( shift_w ) { m_shift = state; } DECLARE_WRITE_LINE_MEMBER( control_w ) { m_control = state; } DECLARE_WRITE_LINE_MEMBER( alpha_w ) { m_alpha = state; } protected: // device-level overrides virtual void device_start() override; virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override; void change_output_lines(); void clock_scan_counters(); void detect_keypress(); private: devcb_read8 m_read_d1; devcb_read8 m_read_d2; devcb_read8 m_read_d3; devcb_read8 m_read_d4; devcb_read8 m_read_d5; devcb_read8 m_read_d6; devcb_read8 m_read_d7; devcb_read8 m_read_d8; devcb_read8 m_read_d9; devcb_read8 m_read_d10; devcb_read8 m_read_d11; devcb_write_line m_write_da; devcb_write_line m_write_rpt; bool m_inhibit; // scan counter clock inhibit int m_sense; // sense input scan counter int m_drive; // modifier inputs int m_shift; int m_shift_latch; // latched shift modifier int m_control; int m_control_latch; // latched control modifier int m_alpha; int m_da; // data available flag int m_next_da; // next value of data available flag int m_rpt; // repeat flag int m_next_rpt; // next value of repeat flag // timers emu_timer *m_scan_timer; // keyboard scan timer static const uint8_t key_codes[4][11][8]; }; DECLARE_DEVICE_TYPE(CDP1871, cdp1871_device) #endif // MAME_MACHINE_CDP1871_H