summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/tvc/hbf.cpp
blob: bb9dcae91dbfe1e447825a883d9fbb8fe12e308a (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
// license:BSD-3-Clause
// copyright-holders:Sandro Ronco
/***************************************************************************

    hbf.c

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

#include "emu.h"
#include "hbf.h"


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

FLOPPY_FORMATS_MEMBER( tvc_hbf_device::floppy_formats )
	FLOPPY_TVC_FORMAT
FLOPPY_FORMATS_END

static void tvc_hbf_floppies(device_slot_interface &device)
{
	device.option_add("525qd", FLOPPY_525_QD);
}

ROM_START( tvc_hbf )
	ROM_REGION(0x4000, "hbf", 0)
	ROM_DEFAULT_BIOS("basic")
	ROM_SYSTEM_BIOS( 0, "basic", "BASIC" )
	ROMX_LOAD("hbf.rom",        0x0000, 0x4000, CRC(ae34982b) SHA1(96c4154c04086c537ae1272fe051a256d2f5be3f), ROM_BIOS(0))
	ROM_SYSTEM_BIOS( 1, "upm", "UPM" )
	ROMX_LOAD("d_tvcupm.128",   0x0000, 0x4000, CRC(b3a567ad) SHA1(f92df6074b07f5f19e8c96ff1315da0cfeec9f74), ROM_BIOS(1))
	ROM_SYSTEM_BIOS( 2, "vtdos11", "VT-DOS v1.1" )
	ROMX_LOAD("d_tvcdos.128",   0x0000, 0x4000, CRC(2acf8477) SHA1(07bf39b633a564f98dd4b2e93bd889501b341550), ROM_BIOS(2))
	ROM_SYSTEM_BIOS( 3, "vtdos12", "VT-DOS v1.2" )
	ROMX_LOAD("d_dos12.128",    0x0000, 0x4000, CRC(f5c35597) SHA1(2fa44ad089a51f453b580e0b13e3be96a0f14649), ROM_BIOS(3))

	ROM_REGION(0x1000, "ram", ROMREGION_ERASE)
ROM_END


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

DEFINE_DEVICE_TYPE(TVC_HBF, tvc_hbf_device, "tvc_hbf", "HBF floppy interface")

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

//-------------------------------------------------
//  tvc_hbf_device - constructor
//-------------------------------------------------

tvc_hbf_device::tvc_hbf_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: device_t(mconfig, TVC_HBF, tag, owner, clock),
	device_tvcexp_interface( mconfig, *this ),
	m_fdc(*this, "fdc"), m_rom(nullptr), m_ram(nullptr), m_rom_bank(0)
{
}


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

void tvc_hbf_device::device_start()
{
	m_rom = memregion("hbf")->base();
	m_ram = memregion("ram")->base();
}

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

void tvc_hbf_device::device_reset()
{
	m_rom_bank = 0;
}

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

void tvc_hbf_device::device_add_mconfig(machine_config &config)
{
	FD1793(config, m_fdc, 16_MHz_XTAL / 16);

	FLOPPY_CONNECTOR(config, "fdc:0", tvc_hbf_floppies, "525qd", tvc_hbf_device::floppy_formats);
	FLOPPY_CONNECTOR(config, "fdc:1", tvc_hbf_floppies, "525qd", tvc_hbf_device::floppy_formats);
}


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

const tiny_rom_entry *tvc_hbf_device::device_rom_region() const
{
	return ROM_NAME( tvc_hbf );
}

/*-------------------------------------------------
    read
-------------------------------------------------*/
READ8_MEMBER(tvc_hbf_device::read)
{
	if (offset>=0x1000)
		return m_ram[offset& 0x0fff];
	else
		return m_rom[(m_rom_bank<<12) + (offset & 0x0fff)];
}

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

WRITE8_MEMBER(tvc_hbf_device::write)
{
	if (offset>=0x1000)
		m_ram[offset & 0x0fff] = data;
	else
		logerror("'%s': unmapped write to %04x %02x\n", tag(), offset, data);
}


//-------------------------------------------------
//  IO read
//-------------------------------------------------

READ8_MEMBER(tvc_hbf_device::io_read)
{
	switch((offset>>2) & 0x03)
	{
		case 0x00:
			return m_fdc->read(offset & 3);
		case 0x01:
			return (m_fdc->drq_r()<<7) | (m_fdc->intrq_r() ? 0x01 : 0x00);
		default:
			return 0x00;
	}
}

//-------------------------------------------------
//  IO write
//-------------------------------------------------

WRITE8_MEMBER(tvc_hbf_device::io_write)
{
	switch((offset>>2) & 0x03)
	{
		case 0x00:
			m_fdc->write(offset & 3, data);
			break;
		case 0x01:
		{
			// bit 0-3   drive select
			// bit 5     DDEN
			// bit 6     floppy motor
			// bit 7     side select
			floppy_image_device *floppy = nullptr;

			if (BIT(data, 0)) floppy = subdevice<floppy_connector>("fdc:0")->get_device();
			if (BIT(data, 1)) floppy = subdevice<floppy_connector>("fdc:1")->get_device();
			m_fdc->set_floppy(floppy);
			m_fdc->dden_w(BIT(data, 5));
			if (floppy) floppy->mon_w(!BIT(data, 6));
			if (floppy) floppy->ss_w(BIT(data, 7));
			break;
		}
		case 0x02:
			m_rom_bank = (data>>4) & 0x03;
			break;
	}
}