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+/**********************************************************************
+
+ Intel 8155/8156 - 2048-Bit Static MOS RAM with I/O Ports and Timer emulation
+ 8156 is the same as 8155, except that chip enable is active high instead of low
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************
+ _____ _____
+ 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
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __I8155__
+#define __I8155__
+
+#include "emu.h"
+
+
+
+//**************************************************************************
+// MACROS / CONSTANTS
+//**************************************************************************
+
+
+
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_I8155_ADD(_tag, _clock, _config) \
+ MCFG_DEVICE_ADD((_tag), I8155, _clock) \
+ MCFG_DEVICE_CONFIG(_config)
+
+
+#define MCFG_I8156_ADD(_tag, _clock, _config) \
+ MCFG_DEVICE_ADD((_tag), I8156, _clock) \
+ MCFG_DEVICE_CONFIG(_config)
+
+
+#define I8155_INTERFACE(name) \
+ const i8155_interface (name) =
+
+
+#define I8156_INTERFACE(name) \
+ const i8155_interface (name) =
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> i8155_interface
+
+struct i8155_interface
+{
+ devcb_read8 in_pa_cb;
+ devcb_write8 out_pa_cb;
+
+ devcb_read8 in_pb_cb;
+ devcb_write8 out_pb_cb;
+
+ devcb_read8 in_pc_cb;
+ devcb_write8 out_pc_cb;
+
+ // this gets called for each change of the TIMER OUT pin (pin 6)
+ devcb_write_line out_to_cb;
+};
+
+
+
+// ======================> i8155_device
+
+class i8155_device : public device_t,
+ public device_memory_interface,
+ public i8155_interface
+{
+public:
+ // construction/destruction
+ i8155_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ DECLARE_READ8_MEMBER( io_r );
+ DECLARE_WRITE8_MEMBER( io_w );
+
+ DECLARE_READ8_MEMBER( memory_r );
+ DECLARE_WRITE8_MEMBER( memory_w );
+
+ DECLARE_WRITE8_MEMBER( ale_w );
+ DECLARE_READ8_MEMBER( read );
+ DECLARE_WRITE8_MEMBER( write );
+
+protected:
+ // device-level overrides
+ virtual void device_config_complete();
+ virtual void device_start();
+ virtual void device_reset();
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
+
+ virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const;
+
+ inline UINT8 get_timer_mode();
+ inline void timer_output();
+ inline void pulse_timer_output();
+ inline int get_port_mode(int port);
+ inline UINT8 read_port(int port);
+ inline void write_port(int port, UINT8 data);
+
+ void register_w(int offset, UINT8 data);
+
+private:
+ devcb_resolved_read8 m_in_port_func[3];
+ devcb_resolved_write8 m_out_port_func[3];
+ devcb_resolved_write_line m_out_to_func;
+
+ // CPU interface
+ int m_io_m; // I/O or memory select
+ UINT8 m_ad; // address
+
+ // registers
+ UINT8 m_command; // command register
+ UINT8 m_status; // status register
+ UINT8 m_output[3]; // output latches
+
+ // counter
+ UINT16 m_count_length; // count length register
+ UINT16 m_counter; // counter register
+ int m_to; // timer output
+
+ // timers
+ emu_timer *m_timer; // counter timer
+
+ const address_space_config m_space_config;
+};
+
+
+// device type definition
+extern const device_type I8155;
+extern const device_type I8156;
+
+
+
+#endif