summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/acorn/cms/fdc.cpp
blob: fc9afd47fa4cdc928f70162429eb0219b12cfc96 (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
// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************

    CMS Floppy Disc Controller Board

    Part No. CMS 0015-1

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


#include "emu.h"
#include "fdc.h"


//**************************************************************************
//  DEVICE DEFINITIONS
//**************************************************************************

DEFINE_DEVICE_TYPE(CMS_FDC, cms_fdc_device, "cms_fdc", "CMS Floppy Disc Controller Board")

//-------------------------------------------------
//  MACHINE_DRIVER( cms_fdc )
//-------------------------------------------------

FLOPPY_FORMATS_MEMBER(cms_fdc_device::floppy_formats )
	FLOPPY_ACORN_SSD_FORMAT
FLOPPY_FORMATS_END

static void cms_floppies(device_slot_interface &device)
{
	device.option_add("35dd", FLOPPY_35_DD);
}

//-------------------------------------------------
//  device_add_mconfig - add device configuration
//-------------------------------------------------

void cms_fdc_device::device_add_mconfig(machine_config &config)
{
	WD1770(config, m_fdc, 8_MHz_XTAL);
	//m_fdc->intrq_wr_callback().set(FUNC(cms_fdc_device::bus_irq_w));
	//m_fdc->drq_wr_callback().set(FUNC(cms_fdc_device::bus_nmi_w));
	FLOPPY_CONNECTOR(config, m_floppy[0], cms_floppies, "35dd", floppy_formats);
	m_floppy[0]->enable_sound(true);
	FLOPPY_CONNECTOR(config, m_floppy[1], cms_floppies, "35dd", floppy_formats);
	m_floppy[1]->enable_sound(true);
	FLOPPY_CONNECTOR(config, m_floppy[2], cms_floppies, nullptr, floppy_formats);
	m_floppy[2]->enable_sound(true);
}


//**************************************************************************
//  LIVE DEVICE
//**************************************************************************

//-------------------------------------------------
//  cms_fdc_device - constructor
//-------------------------------------------------

cms_fdc_device::cms_fdc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: device_t(mconfig, CMS_FDC, tag, owner, clock)
	, device_acorn_bus_interface(mconfig, *this)
	, m_fdc(*this, "wd1770")
	, m_floppy(*this, "wd1770:%u", 0)
{
}


//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void cms_fdc_device::device_start()
{
	address_space &space = m_bus->memspace();

	space.install_readwrite_handler(0xfc50, 0xfc5f, read8_delegate(FUNC(cms_fdc_device::wd1770_state_r), this), write8_delegate(FUNC(cms_fdc_device::wd1770_control_w), this));
	space.install_readwrite_handler(0xfc40, 0xfc4f, read8_delegate(FUNC(wd1770_device::read), m_fdc.target()), write8_delegate(FUNC(wd1770_device::write), m_fdc.target()));
}


//**************************************************************************
//  IMPLEMENTATION
//**************************************************************************

READ8_MEMBER(cms_fdc_device::wd1770_state_r)
{
	uint8_t data = 0x3f;

	data |= m_fdc->intrq_r() << 6;
	data |= m_fdc->drq_r() << 7;
	logerror("floppy state %02x\n", data);
	return data;
}

WRITE8_MEMBER(cms_fdc_device::wd1770_control_w)
{
	floppy_image_device *floppy = nullptr;
	logerror("floppy control %02x\n", data);

	// bit 0, 1, 2: drive select
	if (BIT(data, 0)) floppy = m_floppy[0]->get_device();
	if (BIT(data, 1)) floppy = m_floppy[1]->get_device();
	if (BIT(data, 2)) floppy = m_floppy[2]->get_device();
	m_fdc->set_floppy(floppy);

	// bit 3: side select
	if (floppy)
		floppy->ss_w(BIT(data, 3));

	// bit 7: density ??
	m_fdc->dden_w(BIT(data, 7));
}

WRITE_LINE_MEMBER(cms_fdc_device::bus_nmi_w)
{
	m_bus->nmi_w(state);
}

WRITE_LINE_MEMBER(cms_fdc_device::bus_irq_w)
{
	m_bus->irq_w(state);
}