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+/***************************************************************************
+
+ Intel 8279 Programmable Keyboard/Display Interface emulation
+
+ Copyright the MESS Team 2012.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+****************************************************************************
+ _____ _____
+ RL2 1 |* \_/ | 40 Vcc
+ RL3 2 | | 39 RL1
+ CLK 3 | | 38 RL0
+ IRQ 4 | | 37 CNTL/STB
+ RL4 5 | | 36 SHIFT
+ RL5 6 | | 35 SL3
+ RL6 7 | | 34 SL2
+ RL7 8 | | 33 SL1
+ RESET 9 | | 32 SL0
+ /RD 10 | 8279 | 31 B0
+ /WR 11 | | 30 B1
+ DB0 12 | | 29 B2
+ DB1 13 | | 28 B3
+ DB2 14 | | 27 A0
+ DB3 15 | | 26 A1
+ DB4 16 | | 25 A2
+ DB5 17 | | 24 A3
+ DB6 18 | | 23 /BD
+ DB7 19 | | 22 /CS
+ Vss 20 |_____________| 21 CTRL/DATA
+
+
+***************************************************************************/
+
+#pragma once
+
+#ifndef __I8279__
+#define __I8279__
+
+#include "emu.h"
+
+
+
+/***************************************************************************
+ DEVICE CONFIGURATION MACROS
+***************************************************************************/
+
+#define MCFG_I8279_ADD(_tag, _clock, _config) \
+ MCFG_DEVICE_ADD(_tag, I8279, _clock) \
+ MCFG_DEVICE_CONFIG(_config)
+
+#define I8279_INTERFACE(_name) \
+ const i8279_interface (_name) =
+
+
+/***************************************************************************
+ TYPE DEFINITIONS
+***************************************************************************/
+
+
+// ======================> i8279_interface
+
+struct i8279_interface
+{
+ devcb_write_line m_out_irq_cb; // IRQ
+ devcb_write8 m_out_sl_cb; // Scanlines SL0-3
+ devcb_write8 m_out_disp_cb; // B0-3,A0-3
+ devcb_write_line m_out_bd_cb; // BD
+ devcb_read8 m_in_rl_cb; // kbd readlines RL0-7
+ devcb_read_line m_in_shift_cb; // Shift key
+ devcb_read_line m_in_ctrl_cb; // Ctrl-Strobe line
+};
+
+
+
+// ======================> i8279_device
+
+class i8279_device : public device_t, public i8279_interface
+{
+public:
+ // construction/destruction
+ i8279_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ // read & write handlers
+ DECLARE_READ8_MEMBER(status_r);
+ DECLARE_READ8_MEMBER(data_r);
+ DECLARE_WRITE8_MEMBER(cmd_w);
+ DECLARE_WRITE8_MEMBER(data_w);
+ void timer_mainloop();
+
+protected:
+ // device-level overrides
+ virtual void device_config_complete();
+ virtual void device_start();
+ virtual void device_reset();
+ virtual void device_post_load() { }
+ virtual void device_clock_changed() { }
+
+ static TIMER_CALLBACK( timerproc_callback );
+
+private:
+
+ void timer_adjust();
+ void clear_display();
+ void new_key(UINT8 data, bool skey, bool ckey);
+ void new_fifo(UINT8 data);
+ UINT8 get_segments();
+ void set_irq(bool state);
+ void set_display_mode(UINT8 data);
+
+ devcb_resolved_write_line m_out_irq_func;
+ devcb_resolved_write8 m_out_sl_func;
+ devcb_resolved_write8 m_out_disp_func;
+ devcb_resolved_write_line m_out_bd_func;
+ devcb_resolved_read8 m_in_rl_func;
+ devcb_resolved_read_line m_in_shift_func;
+ devcb_resolved_read_line m_in_ctrl_func;
+
+ emu_timer *m_timer;
+
+ UINT8 m_d_ram[16]; // display ram
+ UINT8 m_d_ram_ptr;
+ UINT8 m_s_ram[8]; // might be same as fifo ram
+ UINT8 m_s_ram_ptr;
+ UINT8 m_fifo[8]; // queued keystrokes
+ UINT8 m_cmd[8]; // Device settings
+ UINT8 m_status; // Returned via status_r
+ UINT32 m_clock; // Internal scan clock
+ UINT8 m_scanner; // next output on SL lines
+
+ bool m_autoinc; // auto-increment flag
+ bool m_read_flag; // read from where
+ bool m_ctrl_key; // previous state of strobe input
+ UINT16 m_key_down;
+};
+
+
+// device type definition
+extern const device_type I8279;
+
+
+
+#endif