summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/electron/cart/stlefs.cpp
blob: a47dca06e67697aec8e74477b185742cc8a80919 (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
// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************

    Solidisk EFS

    http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/Solidisk_EFS.html

    TODO:
    - add Winchester slot
    - unknown how 16K RAM is paged as SWR (adverts claim it was unreliable)

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


#include "emu.h"
#include "stlefs.h"


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

DEFINE_DEVICE_TYPE(ELECTRON_STLEFS, electron_stlefs_device, "electron_stlefs", "Solidisk EFS")


//-------------------------------------------------
//  MACHINE_DRIVER( stlefs )
//-------------------------------------------------

FLOPPY_FORMATS_MEMBER(electron_stlefs_device::floppy_formats)
	FLOPPY_ACORN_SSD_FORMAT,
	FLOPPY_ACORN_DSD_FORMAT,
	FLOPPY_ACORN_ADFS_OLD_FORMAT
FLOPPY_FORMATS_END

void stlefs_floppies(device_slot_interface &device)
{
	device.option_add("35dd",  FLOPPY_35_DD);
	device.option_add("525qd", FLOPPY_525_QD);
}

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

MACHINE_CONFIG_START(electron_stlefs_device::device_add_mconfig)
	/* fdc */
	MCFG_WD1770_ADD("fdc", 16_MHz_XTAL / 2)
	MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE(electron_stlefs_device, fdc_intrq_w))
	MCFG_WD_FDC_DRQ_CALLBACK(WRITELINE(electron_stlefs_device, fdc_drq_w))
	MCFG_FLOPPY_DRIVE_ADD("fdc:0", stlefs_floppies, "525qd", electron_stlefs_device::floppy_formats)
	MCFG_FLOPPY_DRIVE_SOUND(true)
	MCFG_FLOPPY_DRIVE_ADD("fdc:1", stlefs_floppies, nullptr, electron_stlefs_device::floppy_formats)
	MCFG_FLOPPY_DRIVE_SOUND(true)
MACHINE_CONFIG_END

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

//-------------------------------------------------
//  electron_stlefs_device - constructor
//-------------------------------------------------

electron_stlefs_device::electron_stlefs_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: device_t(mconfig, ELECTRON_STLEFS, tag, owner, clock)
	, device_electron_cart_interface(mconfig, *this)
	, m_fdc(*this, "fdc")
	, m_floppy0(*this, "fdc:0")
	, m_floppy1(*this, "fdc:1")
{
}

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

void electron_stlefs_device::device_start()
{
}

//-------------------------------------------------
//  read - cartridge data read
//-------------------------------------------------

uint8_t electron_stlefs_device::read(address_space &space, offs_t offset, int infc, int infd, int romqa)
{
	uint8_t data = 0xff;

	if (infc)
	{
		switch (offset & 0xff)
		{
		case 0xc4:
		case 0xc5:
		case 0xc6:
		case 0xc7:
			data = m_fdc->read(space, offset & 0x03);
			break;
		}
	}

	if (!infc && !infd)
	{
		if (offset >= 0x0000 && offset < 0x4000)
		{
			data = m_rom[(offset & 0x3fff) + (romqa * 0x4000)];
		}
	}

	return data;
}

//-------------------------------------------------
//  write - cartridge data write
//-------------------------------------------------

void electron_stlefs_device::write(address_space &space, offs_t offset, uint8_t data, int infc, int infd, int romqa)
{
	if (infc)
	{
		switch (offset & 0xff)
		{
		case 0xc0:
			wd1770_control_w(space, 0, data);
			break;
		case 0xc4:
		case 0xc5:
		case 0xc6:
		case 0xc7:
			m_fdc->write(space, offset & 0x03, data);
			break;
		//case 0xcb:
			//m_page_register = data;
		}
	}
}


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

WRITE8_MEMBER(electron_stlefs_device::wd1770_control_w)
{
	floppy_image_device *floppy = nullptr;

	// bit 0, 1: drive select
	if (BIT(data, 0)) floppy = m_floppy0->get_device();
	if (BIT(data, 1)) floppy = m_floppy1->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();
}

void electron_stlefs_device::fdc_intrq_w(int state)
{
	m_slot->irq_w(state);
}

void electron_stlefs_device::fdc_drq_w(int state)
{
	m_slot->nmi_w(state);
}