summaryrefslogtreecommitdiffstats
path: root/src/devices/bus/ti99/peb/ti_fdc.h
blob: 4c07bcb142e71fd97e802c4256e064ff313a7cf3 (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
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
// license:LGPL-2.1+
// copyright-holders:Michael Zapf
/****************************************************************************

    TI-99 Standard Floppy Disk Controller Card
    See ti_fdc.c for documentation

    Michael Zapf

    September 2010
    January 2012: rewritten as class (MZ)

****************************************************************************/
#ifndef MAME_BUS_TI99_PEB_TI_FDC_H
#define MAME_BUS_TI99_PEB_TI_FDC_H

#pragma once

#include "peribox.h"
#include "machine/74259.h"
#include "machine/wd_fdc.h"
#include "imagedev/floppy.h"

namespace bus { namespace ti99 { namespace peb {

class ti_fdc_device : public device_t, public device_ti99_peribox_card_interface
{
public:
	ti_fdc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
	DECLARE_READ8Z_MEMBER(readz) override;
	void write(offs_t offset, uint8_t data) override;
	DECLARE_SETADDRESS_DBIN_MEMBER(setaddress_dbin) override;

	DECLARE_READ8Z_MEMBER(crureadz) override;
	void cruwrite(offs_t offset, uint8_t data) override;

	// bool dvena_r();

protected:
	void device_start() override;
	void device_reset() override;
	void device_config_complete() override;

	const tiny_rom_entry *device_rom_region() const override;
	virtual void device_add_mconfig(machine_config &config) override;

	void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;

private:
	DECLARE_FLOPPY_FORMATS( floppy_formats );

	DECLARE_WRITE_LINE_MEMBER(fdc_irq_w);
	DECLARE_WRITE_LINE_MEMBER(fdc_drq_w);

	DECLARE_WRITE_LINE_MEMBER(dskpgena_w);
	DECLARE_WRITE_LINE_MEMBER(kaclk_w);
	DECLARE_WRITE_LINE_MEMBER(waiten_w);
	DECLARE_WRITE_LINE_MEMBER(hlt_w);
	DECLARE_WRITE_LINE_MEMBER(dsel_w);
	DECLARE_WRITE_LINE_MEMBER(sidsel_w);

	// For debugger access
	void debug_read(offs_t offset, uint8_t* value);

	// Wait state logic
	void operate_ready_line();

	// Set the current floppy
	void set_drive();

	// Operate the floppy motors
	void set_floppy_motors_running(bool run);

	// Recent address
	int     m_address;

	// Holds the status of the DRQ and IRQ lines.
	int  m_DRQ, m_IRQ;

	// Latched CRU outputs
	required_device<ls259_device> m_crulatch;

	// Signal DVENA. When true, makes some drive turning.
	int  m_DVENA;

	// Set when address is in card area
	bool    m_inDsrArea;

	// When true the CPU is halted while DRQ/IRQ are true.
	bool    m_WAITena;

	// WD chip selected
	bool    m_WDsel;

	// Indicates which drive has been selected. Values are 0, 1, 2, and 4.
	// 000 = no drive
	// 001 = drive 1
	// 010 = drive 2
	// 100 = drive 3
	int         m_DSEL;

	// Signal SIDSEL. 0 or 1, indicates the selected head.
	int        m_SIDSEL;

	// count 4.23s from rising edge of motor_on
	emu_timer*  m_motor_on_timer;

	// Link to the FDC1771 controller on the board.
	required_device<fd1771_device>   m_fd1771;

	// DSR ROM
	uint8_t*  m_dsrrom;

	// Link to the attached floppy drives
	floppy_image_device*    m_floppy[3];

	// Currently selected floppy drive
	int  m_current;
};

} } } // end namespace bus::ti99::peb

DECLARE_DEVICE_TYPE_NS(TI99_FDC, bus::ti99::peb, ti_fdc_device)

#endif // MAME_BUS_TI99_PEB_TI_FDC_H