summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/bml3/bml3mp1802.cpp
blob: dd27a9c53ec7ff578930aa232abcf3f15cc7bf70 (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
// license:GPL-2.0+
// copyright-holders:Jonathan Edwards
/*********************************************************************

    bml3mp1802.c

    Hitachi MP-1802 floppy disk controller card for the MB-6890
    Hitachi MP-3550 floppy drive is attached

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

#include "emu.h"
#include "bml3mp1802.h"


/***************************************************************************
    PARAMETERS
***************************************************************************/

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

DEFINE_DEVICE_TYPE(BML3BUS_MP1802, bml3bus_mp1802_device, "bml3mp1802", "Hitachi MP-1802 Floppy Controller Card")

static SLOT_INTERFACE_START( mp1802_floppies )
	SLOT_INTERFACE("dd", FLOPPY_525_DD)
SLOT_INTERFACE_END

WRITE_LINE_MEMBER( bml3bus_mp1802_device::bml3_wd17xx_intrq_w )
{
	if (state) {
		m_bml3bus->set_nmi_line(PULSE_LINE);
	}
}

#define MP1802_ROM_REGION  "mp1802_rom"

ROM_START( mp1802 )
	ROM_REGION(0x10000, MP1802_ROM_REGION, 0)
	// MP-1802 disk controller ROM, which replaces part of the system ROM
	ROM_LOAD( "mp1802.rom", 0xf800, 0x800, BAD_DUMP CRC(8d0dc101) SHA1(92f7d1cebecafa7472e45c4999520de5c01c6dbc))
ROM_END


/***************************************************************************
    FUNCTION PROTOTYPES
***************************************************************************/

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

MACHINE_CONFIG_START(bml3bus_mp1802_device::device_add_mconfig)
	MCFG_MB8866_ADD("fdc", XTAL(1'000'000))
	MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE(bml3bus_mp1802_device, bml3_wd17xx_intrq_w))

	MCFG_FLOPPY_DRIVE_ADD("fdc:0", mp1802_floppies, "dd", floppy_image_device::default_floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD("fdc:1", mp1802_floppies, "dd", floppy_image_device::default_floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD("fdc:2", mp1802_floppies, "", floppy_image_device::default_floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD("fdc:3", mp1802_floppies, "", floppy_image_device::default_floppy_formats)
MACHINE_CONFIG_END

//-------------------------------------------------
//  rom_region - device-specific ROM region
//-------------------------------------------------

const tiny_rom_entry *bml3bus_mp1802_device::device_rom_region() const
{
	return ROM_NAME( mp1802 );
}

READ8_MEMBER( bml3bus_mp1802_device::bml3_mp1802_r)
{
	return m_fdc->drq_r() ? 0x00 : 0x80;
}

WRITE8_MEMBER( bml3bus_mp1802_device::bml3_mp1802_w)
{
	floppy_image_device *floppy = nullptr;

	switch (data & 0x03)
	{
	case 0: floppy = m_floppy0->get_device(); break;
	case 1: floppy = m_floppy1->get_device(); break;
	case 2: floppy = m_floppy2->get_device(); break;
	case 3: floppy = m_floppy3->get_device(); break;
	}

	m_fdc->set_floppy(floppy);

	if (floppy)
	{
		floppy->mon_w(!BIT(data, 3));
		floppy->ss_w(BIT(data, 4));
	}
}


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

bml3bus_mp1802_device::bml3bus_mp1802_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	device_t(mconfig, BML3BUS_MP1802, tag, owner, clock),
	device_bml3bus_card_interface(mconfig, *this),
	m_fdc(*this, "fdc"),
	m_floppy0(*this, "fdc:0"),
	m_floppy1(*this, "fdc:1"),
	m_floppy2(*this, "fdc:2"),
	m_floppy3(*this, "fdc:3"), m_rom(nullptr)
{
}


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

void bml3bus_mp1802_device::device_start()
{
	// set_bml3bus_device makes m_slot valid
	set_bml3bus_device();

	m_rom = memregion(MP1802_ROM_REGION)->base();

	// install into memory
	address_space &space_prg = m_bml3bus->space();
	space_prg.install_readwrite_handler(0xff00, 0xff03, read8_delegate(FUNC(mb8866_device::read),(mb8866_device*)m_fdc), write8_delegate(FUNC(mb8866_device::write),(mb8866_device*)m_fdc));
	space_prg.install_readwrite_handler(0xff04, 0xff04, read8_delegate(FUNC(bml3bus_mp1802_device::bml3_mp1802_r), this), write8_delegate(FUNC(bml3bus_mp1802_device::bml3_mp1802_w), this));
	// overwriting the main ROM (rather than using e.g. install_rom) should mean that bank switches for RAM expansion still work...
	uint8_t *mainrom = device().machine().root_device().memregion("maincpu")->base();
	memcpy(mainrom + 0xf800, m_rom + 0xf800, 0x800);
}

void bml3bus_mp1802_device::device_reset()
{
}