summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/spc1000/fdd.cpp
blob: 7d8f94e2653710be97728bd287d5966757828971 (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
// license:BSD-3-Clause
// copyright-holders:Fabio Priuli
/***************************************************************************

    SPC-1000 FDD unit

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

#include "emu.h"
#include "fdd.h"


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

READ8_MEMBER(spc1000_fdd_exp_device::i8255_c_r)
{
	return m_i8255_0_pc >> 4;
}

WRITE8_MEMBER(spc1000_fdd_exp_device::i8255_b_w)
{
	m_i8255_portb = data;
}

WRITE8_MEMBER(spc1000_fdd_exp_device::i8255_c_w)
{
	m_i8255_1_pc = data;
}

//-------------------------------------------------
//  fdc interrupt
//-------------------------------------------------

READ8_MEMBER( spc1000_fdd_exp_device::tc_r )
{
	logerror("%s: tc_r\n", machine().describe_context());

	// toggle tc on read
	m_fdc->tc_w(true);
	m_timer_tc->adjust(attotime::zero);

	return 0xff;
}

WRITE8_MEMBER( spc1000_fdd_exp_device::control_w )
{
	logerror("%s: control_w(%02x)\n", machine().describe_context(), data);

	// bit 0, motor on signal
	if (m_fd0)
		m_fd0->mon_w(!BIT(data, 0));
	if (m_fd1)
		m_fd1->mon_w(!BIT(data, 0));
}

void spc1000_fdd_exp_device::sd725_mem(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x1fff).rom();
	map(0x2000, 0xffff).ram();
}

void spc1000_fdd_exp_device::sd725_io(address_map &map)
{
	map.unmap_value_high();
	map.global_mask(0xff);
	map(0xf8, 0xf8).rw(this, FUNC(spc1000_fdd_exp_device::tc_r), FUNC(spc1000_fdd_exp_device::control_w)); // (R) Terminal Count Port (W) Motor Control Port
	map(0xfa, 0xfb).m("upd765", FUNC(upd765a_device::map));
	map(0xfc, 0xff).rw("d8255_master", FUNC(i8255_device::read), FUNC(i8255_device::write));
}

static SLOT_INTERFACE_START( sd725_floppies )
	SLOT_INTERFACE("sd320", EPSON_SD_320)
SLOT_INTERFACE_END

//-------------------------------------------------
//  device_add_mconfig
//-------------------------------------------------

MACHINE_CONFIG_START(spc1000_fdd_exp_device::device_add_mconfig)

	// sub CPU (5 inch floppy drive)
	MCFG_CPU_ADD("fdccpu", Z80, XTAL(4'000'000))
	MCFG_CPU_PROGRAM_MAP(sd725_mem)
	MCFG_CPU_IO_MAP(sd725_io)

	MCFG_DEVICE_ADD("d8255_master", I8255, 0)
	MCFG_I8255_IN_PORTA_CB(DEVREAD8("d8255_master", i8255_device, pb_r))
	MCFG_I8255_IN_PORTB_CB(DEVREAD8("d8255_master", i8255_device, pa_r))
	MCFG_I8255_OUT_PORTB_CB(WRITE8(spc1000_fdd_exp_device, i8255_b_w))
	MCFG_I8255_IN_PORTC_CB(READ8(spc1000_fdd_exp_device, i8255_c_r))
	MCFG_I8255_OUT_PORTC_CB(WRITE8(spc1000_fdd_exp_device, i8255_c_w))

	// floppy disk controller
	MCFG_UPD765A_ADD("upd765", true, true)
	MCFG_UPD765_INTRQ_CALLBACK(INPUTLINE("fdccpu", INPUT_LINE_IRQ0))

	// floppy drives
	MCFG_FLOPPY_DRIVE_ADD("upd765:0", sd725_floppies, "sd320", floppy_image_device::default_floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD("upd765:1", sd725_floppies, "sd320", floppy_image_device::default_floppy_formats)
MACHINE_CONFIG_END

ROM_START( spc1000_fdd )
	ROM_REGION(0x10000, "fdccpu", 0)
	ROM_LOAD("sd725a.bin", 0x0000, 0x1000, CRC(96ac2eb8) SHA1(8e9d8f63a7fb87af417e95603e71cf537a6e83f1))
ROM_END

//-------------------------------------------------
//  device_rom_region
//-------------------------------------------------

const tiny_rom_entry *spc1000_fdd_exp_device::device_rom_region() const
{
	return ROM_NAME( spc1000_fdd );
}


//**************************************************************************
//  GLOBAL VARIABLES
//**************************************************************************

DEFINE_DEVICE_TYPE(SPC1000_FDD_EXP, spc1000_fdd_exp_device, "spc1000_fdd_exp", "SPC1000 FDD expansion")

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

//-------------------------------------------------
//  spc1000_fdd_exp_device - constructor
//-------------------------------------------------

spc1000_fdd_exp_device::spc1000_fdd_exp_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	device_t(mconfig, SPC1000_FDD_EXP, tag, owner, clock),
	device_spc1000_card_interface(mconfig, *this),
	m_cpu(*this, "fdccpu"),
	m_fdc(*this, "upd765"),
	m_pio(*this, "d8255_master"),
	m_fd0(nullptr), m_fd1(nullptr), m_timer_tc(nullptr), m_i8255_0_pc(0), m_i8255_1_pc(0), m_i8255_portb(0)
{
}


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

void spc1000_fdd_exp_device::device_start()
{
	m_timer_tc = timer_alloc(TIMER_TC);
	m_timer_tc->adjust(attotime::never);

	m_fd0 = subdevice<floppy_connector>("upd765:0")->get_device();
	m_fd1 = subdevice<floppy_connector>("upd765:1")->get_device();
}

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

void spc1000_fdd_exp_device::device_reset()
{
	m_cpu->set_input_line_vector(0, 0);

	// enable rom (is this really needed? it does not seem necessary for FDD to work)
	m_cpu->space(AS_PROGRAM).install_rom(0x0000, 0x0fff, 0x2000, memregion("fdccpu")->base());
}

void spc1000_fdd_exp_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
	switch (id)
	{
		case TIMER_TC:
			m_fdc->tc_w(false);
			break;
	}
}

/*-------------------------------------------------
    read
-------------------------------------------------*/

READ8_MEMBER(spc1000_fdd_exp_device::read)
{
	// this should be m_pio->read on the whole 0x00-0x03 range?
	if (offset >= 3)
		return 0xff;
	else
	{
		uint8_t data = 0;
		switch (offset)
		{
			case 1:
				data = m_i8255_portb;
				break;
			case 2:
				data = m_i8255_1_pc >> 4;
				break;
		}
		return data;
	}
}

//-------------------------------------------------
//  write
//-------------------------------------------------

WRITE8_MEMBER(spc1000_fdd_exp_device::write)
{
	// this should be m_pio->write on the whole 0x00-0x03 range?
	if (offset < 3)
	{
		switch (offset)
		{
			case 0:
				m_pio->write(space, 1, data);
				break;
			case 2:
				m_i8255_0_pc = data;
				break;
		}
	}
}