summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/bbc/fdc/watford.cpp
blob: 38dc71049bfc3f9ec67436f81da911a5be33c1f3 (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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************

    Watford Electronics DDB FDC

    DDB : 1770
    DDB2: 1772
    DDB3: 1770 (Acorn compatible)

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


#include "emu.h"
#include "watford.h"


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

const device_type BBC_WEDDB2 = &device_creator<bbc_weddb2_device>;
const device_type BBC_WEDDB3 = &device_creator<bbc_weddb3_device>;


//-------------------------------------------------
//  MACHINE_DRIVER( watford )
//-------------------------------------------------

FLOPPY_FORMATS_MEMBER( floppy_formats )
	FLOPPY_ACORN_SSD_FORMAT,
	FLOPPY_ACORN_DSD_FORMAT,
	FLOPPY_FSD_FORMAT
FLOPPY_FORMATS_END0

static SLOT_INTERFACE_START( bbc_floppies_525 )
	SLOT_INTERFACE("525sssd", FLOPPY_525_SSSD)
	SLOT_INTERFACE("525sd",   FLOPPY_525_SD)
	SLOT_INTERFACE("525ssdd", FLOPPY_525_SSDD)
	SLOT_INTERFACE("525dd",   FLOPPY_525_DD)
	SLOT_INTERFACE("525qd",   FLOPPY_525_QD)
SLOT_INTERFACE_END

static MACHINE_CONFIG_FRAGMENT( weddb2 )
	MCFG_WD1772_ADD("wd1772", XTAL_16MHz / 2)
	MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE(bbc_weddb2_device, fdc_intrq_w))
	MCFG_WD_FDC_DRQ_CALLBACK(WRITELINE(bbc_weddb2_device, fdc_drq_w))
	MCFG_FLOPPY_DRIVE_ADD("wd1772:0", bbc_floppies_525, "525qd", floppy_formats)
	MCFG_FLOPPY_DRIVE_SOUND(true)
	MCFG_FLOPPY_DRIVE_ADD("wd1772:1", bbc_floppies_525, "525qd", floppy_formats)
	MCFG_FLOPPY_DRIVE_SOUND(true)
MACHINE_CONFIG_END

static MACHINE_CONFIG_FRAGMENT( weddb3 )
	MCFG_WD1770_ADD("wd1770", XTAL_16MHz / 2)
	MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE(bbc_weddb3_device, fdc_intrq_w))
	MCFG_WD_FDC_DRQ_CALLBACK(WRITELINE(bbc_weddb3_device, fdc_drq_w))
	MCFG_FLOPPY_DRIVE_ADD("wd1770:0", bbc_floppies_525, "525qd", floppy_formats)
	MCFG_FLOPPY_DRIVE_SOUND(true)
	MCFG_FLOPPY_DRIVE_ADD("wd1770:1", bbc_floppies_525, "525qd", floppy_formats)
	MCFG_FLOPPY_DRIVE_SOUND(true)
MACHINE_CONFIG_END

ROM_START( weddb2 )
	ROM_REGION(0x4000, "dfs_rom", 0)
	ROM_DEFAULT_BIOS("ddfs153")
	ROM_SYSTEM_BIOS(0, "ddfs140", "Watford Electronics DDFS 1.40")
	ROMX_LOAD("ddfs140.rom", 0x0000, 0x4000, CRC(6c6eef94) SHA1(d86b26a6fe7b3532e7bd3c6f3e8e503edac3811c), ROM_BIOS(1))
	ROM_SYSTEM_BIOS(1, "ddfs150", "Watford Electronics DDFS 1.50")
	ROMX_LOAD("ddfs150.rom", 0x0000, 0x4000, CRC(d2fff497) SHA1(7693f14aeed26c34b2342c3487ed4b9ad233e279), ROM_BIOS(2))
	ROM_SYSTEM_BIOS(2, "ddfs153", "Watford Electronics DDFS 1.53")
	ROMX_LOAD("ddfs153.rom", 0x0000, 0x4000, CRC(e1be4ee4) SHA1(6719dc958f2631e6dc8f045429797b289bfe649a), ROM_BIOS(3))
ROM_END

ROM_START( weddb3 )
	ROM_REGION(0x4000, "dfs_rom", 0)
	ROM_DEFAULT_BIOS("ddfs154t")
	ROM_SYSTEM_BIOS(0, "ddfs154t", "Watford Electronics DDFS 1.54T")
	ROMX_LOAD("ddfs154t.rom", 0x0000, 0x4000, CRC(6504c1ed) SHA1(618b7a1551f91e2b18608428b9e581f3d920d4b5), ROM_BIOS(1))
ROM_END


//-------------------------------------------------
//  machine_config_additions - device-specific
//  machine configurations
//-------------------------------------------------

machine_config_constructor bbc_weddb2_device::device_mconfig_additions() const
{
	return MACHINE_CONFIG_NAME( weddb2 );
}

machine_config_constructor bbc_weddb3_device::device_mconfig_additions() const
{
	return MACHINE_CONFIG_NAME( weddb3 );
}

const tiny_rom_entry *bbc_weddb2_device::device_rom_region() const
{
	return ROM_NAME( weddb2 );
}

const tiny_rom_entry *bbc_weddb3_device::device_rom_region() const
{
	return ROM_NAME( weddb3 );
}


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

//-------------------------------------------------
//  bbc_watfordfdc_device - constructor
//-------------------------------------------------

bbc_watfordfdc_device::bbc_watfordfdc_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, uint32_t clock, const char *shortname, const char *source) :
	device_t(mconfig, type, name, tag, owner, clock, shortname, source),
	device_bbc_fdc_interface(mconfig, *this)
{
}

bbc_weddb2_device::bbc_weddb2_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: bbc_watfordfdc_device(mconfig, BBC_WEDDB2, "Watford Electronics DDB2 1772 FDC", tag, owner, clock, "bbc_weddb2", __FILE__),
	m_dfs_rom(*this, "dfs_rom"),
	m_fdc(*this, "wd1772"),
	m_floppy0(*this, "wd1772:0"),
	m_floppy1(*this, "wd1772:1")
{
}

bbc_weddb3_device::bbc_weddb3_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: bbc_watfordfdc_device(mconfig, BBC_WEDDB3, "Watford Electronics DDB3 1770 FDC", tag, owner, clock, "bbc_weddb3", __FILE__),
	m_dfs_rom(*this, "dfs_rom"),
	m_fdc(*this, "wd1770"),
	m_floppy0(*this, "wd1770:0"),
	m_floppy1(*this, "wd1770:1")
{
}

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

void bbc_weddb2_device::device_start()
{
	device_t* cpu = machine().device("maincpu");
	address_space& space = cpu->memory().space(AS_PROGRAM);
	m_slot = dynamic_cast<bbc_fdc_slot_device *>(owner());

	space.install_readwrite_handler(0xfe80, 0xfe83, READ8_DELEGATE(bbc_weddb2_device, wd177xl_read), WRITE8_DELEGATE(bbc_weddb2_device, wd177xl_write));
	space.install_readwrite_handler(0xfe84, 0xfe8f, READ8_DEVICE_DELEGATE(m_fdc, wd_fdc_t, read), WRITE8_DEVICE_DELEGATE(m_fdc, wd_fdc_t, write));
}

void bbc_weddb3_device::device_start()
{
	device_t* cpu = machine().device("maincpu");
	address_space& space = cpu->memory().space(AS_PROGRAM);
	m_slot = dynamic_cast<bbc_fdc_slot_device *>(owner());

	space.install_readwrite_handler(0xfe80, 0xfe83, READ8_DELEGATE(bbc_weddb3_device, wd177xl_read), WRITE8_DELEGATE(bbc_weddb3_device, wd177xl_write));
	space.install_readwrite_handler(0xfe84, 0xfe8f, READ8_DEVICE_DELEGATE(m_fdc, wd_fdc_t, read), WRITE8_DEVICE_DELEGATE(m_fdc, wd_fdc_t, write));
}

//-------------------------------------------------
//  device_reset - device-specific reset
//-------------------------------------------------

void bbc_weddb2_device::device_reset()
{
	machine().root_device().membank("bank4")->configure_entry(12, memregion("dfs_rom")->base());
}

void bbc_weddb3_device::device_reset()
{
	machine().root_device().membank("bank4")->configure_entry(12, memregion("dfs_rom")->base());
}


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

READ8_MEMBER(bbc_weddb2_device::wd177xl_read)
{
	return m_drive_control;
}

WRITE8_MEMBER(bbc_weddb2_device::wd177xl_write)
{
	floppy_image_device *floppy = nullptr;

	m_drive_control = data;

	// bit 2: drive select
	floppy_image_device *floppy0 = m_fdc->subdevice<floppy_connector>("0")->get_device();
	floppy_image_device *floppy1 = m_fdc->subdevice<floppy_connector>("1")->get_device();
	floppy = (BIT(data, 2) ? floppy1 : floppy0);
	m_fdc->set_floppy(floppy);

	// bit 0: density
	m_fdc->dden_w(BIT(data, 0));

	// bit 1: side select
	if (floppy)
		floppy->ss_w(BIT(data, 1));

	// bit 3: reset
	if (!BIT(data, 3)) m_fdc->soft_reset();
}

READ8_MEMBER(bbc_weddb3_device::wd177xl_read)
{
	return m_drive_control;
}

WRITE8_MEMBER(bbc_weddb3_device::wd177xl_write)
{
	floppy_image_device *floppy = nullptr;

	m_drive_control = data;

	// bit 0, 1: drive select
	if (BIT(data, 0)) floppy = m_fdc->subdevice<floppy_connector>("0")->get_device();
	if (BIT(data, 1)) floppy = m_fdc->subdevice<floppy_connector>("1")->get_device();
	m_fdc->set_floppy(floppy);

	// bit 2: side select
	if (floppy)
		floppy->ss_w(BIT(data, 2));

	// bit 3: density
	m_fdc->dden_w(BIT(data, 3));

	// bit 5: reset
	if (!BIT(data, 5)) m_fdc->soft_reset();
}

WRITE_LINE_MEMBER(bbc_watfordfdc_device::fdc_intrq_w)
{
	m_slot->intrq_w(state);
}

WRITE_LINE_MEMBER(bbc_watfordfdc_device::fdc_drq_w)
{
	m_slot->drq_w(state);
}