summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/machine/micropolis.h
blob: dd04d0127ea03626a5490857e5f4613e4dc6e18c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
/*********************************************************************

    micropolis.h

    Implementations of the Micropolis
    floppy disk controller for the Sorcerer

*********************************************************************/

#ifndef __MICROPOLIS_H__
#define __MICROPOLIS_H__

#include "devcb.h"


/***************************************************************************
    TYPE DEFINITIONS
***************************************************************************/

/* Interface */
struct micropolis_interface
{
	devcb_read_line m_in_dden_cb;
	devcb_write_line m_out_intrq_cb;
	devcb_write_line m_out_drq_cb;
	const char *m_floppy_drive_tags[4];
};

/***************************************************************************
    MACROS
***************************************************************************/

class micropolis_device : public device_t,
									public micropolis_interface
{
public:
	micropolis_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
	~micropolis_device() {}

	void set_drive(UINT8 drive); // set current drive (0-3)

	DECLARE_READ8_MEMBER( status_r );
	DECLARE_READ8_MEMBER( data_r );

	DECLARE_WRITE8_MEMBER( command_w );
	DECLARE_WRITE8_MEMBER( data_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();

private:
	// internal state

	devcb_resolved_read_line m_in_dden_func;
	devcb_resolved_write_line m_out_intrq_func;
	devcb_resolved_write_line m_out_drq_func;

	/* register */
	UINT8 m_data;
	UINT8 m_drive_num;
	UINT8 m_track;
	UINT8 m_sector;
	UINT8 m_command;
	UINT8 m_status;

	UINT8   m_write_cmd;              /* last write command issued */

	UINT8   m_buffer[6144];           /* I/O buffer (holds up to a whole track) */
	UINT32  m_data_offset;            /* offset into I/O buffer */
	INT32   m_data_count;             /* transfer count from/into I/O buffer */

	UINT32  m_sector_length;          /* sector length (byte) */

	/* this is the drive currently selected */
	device_t *m_drive;

	void read_sector();
	void write_sector();
};

extern const device_type MICROPOLIS;


/***************************************************************************
    FUNCTION PROTOTYPES
***************************************************************************/

extern const micropolis_interface default_micropolis_interface;


/***************************************************************************
    DEVICE CONFIGURATION MACROS
***************************************************************************/

#define MCFG_MICROPOLIS_ADD(_tag, _intrf) \
	MCFG_DEVICE_ADD(_tag, MICROPOLIS, 0) \
	MCFG_DEVICE_CONFIG(_intrf)

#endif /* __MICROPOLIS_H__ */