summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/c64/fcc.cpp
blob: 07ff8840e3ab51bf318b264cff1dc5d9d5f92483 (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
// license:BSD-3-Clause
// copyright-holders:Curt Coder, hap
/**********************************************************************

Tasc Final ChessCard cartridge emulation

It expects a mouse in port 2, and/or joystick in port 1.

The cartridge includes its own CPU (G65SC02P-4 @ 5MHz), making a relatively
strong chess program possible on C64.
It was also released for IBM PC, with an ISA card.

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

#include "emu.h"
#include "fcc.h"


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

DEFINE_DEVICE_TYPE(C64_FCC, c64_final_chesscard_device, "c64_fcc", "C64 Final ChessCard")


//-------------------------------------------------
//  ADDRESS_MAP( c64_fcc_map )
//-------------------------------------------------

void c64_final_chesscard_device::c64_fcc_map(address_map &map)
{
	map(0x0000, 0x1fff).rw(FUNC(c64_final_chesscard_device::nvram_r), FUNC(c64_final_chesscard_device::nvram_w)); // A13-A15 = low
	//map(0x6000, 0x6000).noprw(); // N/C
	map(0x7f00, 0x7f00).mirror(0x00ff).r(m_sublatch, FUNC(generic_latch_8_device::read)).w(m_mainlatch, FUNC(generic_latch_8_device::write)); // A8-A14 = high
	map(0x8000, 0xffff).r(FUNC(c64_final_chesscard_device::rom_r));
}


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

void c64_final_chesscard_device::device_add_mconfig(machine_config &config)
{
	M65SC02(config, m_maincpu, 5_MHz_XTAL);
	m_maincpu->set_addrmap(AS_PROGRAM, &c64_final_chesscard_device::c64_fcc_map);

	GENERIC_LATCH_8(config, m_mainlatch).data_pending_callback().set(FUNC(c64_final_chesscard_device::mainlatch_int));
	GENERIC_LATCH_8(config, m_sublatch).data_pending_callback().set_inputline(m_maincpu, INPUT_LINE_NMI);
}


//-------------------------------------------------
//  INPUT_PORTS( c64_fcc )
//-------------------------------------------------

static INPUT_PORTS_START( c64_fcc )
	PORT_START("RESET")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_OTHER ) PORT_NAME("Reset") PORT_CODE(KEYCODE_F11) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF_OWNER, c64_expansion_slot_device, reset_w)
INPUT_PORTS_END


//-------------------------------------------------
//  input_ports - device-specific input ports
//-------------------------------------------------

ioport_constructor c64_final_chesscard_device::device_input_ports() const
{
	return INPUT_PORTS_NAME( c64_fcc );
}


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

//-------------------------------------------------
//  c64_final_chesscard_device - constructor
//-------------------------------------------------

c64_final_chesscard_device::c64_final_chesscard_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	device_t(mconfig, C64_FCC, tag, owner, clock),
	device_c64_expansion_card_interface(mconfig, *this),
	device_nvram_interface(mconfig, *this),
	m_maincpu(*this, "maincpu"),
	m_mainlatch(*this, "mainlatch"),
	m_sublatch(*this, "sublatch"),
	m_bank(0),
	m_hidden(0)
{
}


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

void c64_final_chesscard_device::device_start()
{
	m_nvram = std::make_unique<uint8_t[]>(0x2000);

	// state saving
	save_pointer(NAME(m_nvram), 0x2000);
	save_item(NAME(m_bank));
	save_item(NAME(m_hidden));
}


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

void c64_final_chesscard_device::device_reset()
{
	m_mainlatch->read();
	m_sublatch->read();
	m_maincpu->reset();

	m_bank = 0;
	m_hidden = 0;
	m_exrom = 0;
	m_game = 0;
}


//-------------------------------------------------
//  c64_cd_r - cartridge data read
//-------------------------------------------------

uint8_t c64_final_chesscard_device::c64_cd_r(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
{
	if (!roml || !romh)
		data = m_roml[(m_bank << 14) | (offset & 0x3fff)];
	else if (!io2)
		data = m_mainlatch->read();

	return data;
}


//-------------------------------------------------
//  c64_cd_w - cartridge data write
//-------------------------------------------------

void c64_final_chesscard_device::c64_cd_w(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
{
	if (!m_hidden && !io1)
	{
		// d0: rom bank
		// d1: EXROM/GAME
		// d7: hide register
		m_bank = BIT(data, 0);
		m_exrom = BIT(data, 1);
		m_game = BIT(data, 1);
		m_hidden = BIT(data, 7);
	}
	else if (!io2)
		m_sublatch->write(data);
}