summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/c64/rex_ep256.cpp
blob: 266b3b791e10415172073c774625b0c5a89568f5 (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
// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************

    Rex Datentechnik 256KB EPROM cartridge emulation

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

#include "emu.h"
#include "rex_ep256.h"



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

DEFINE_DEVICE_TYPE(C64_REX_EP256, c64_rex_ep256_cartridge_device, "rexexp256", "C64 Rex 256KB EPROM cartridge")


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

void c64_rex_ep256_cartridge_device::device_add_mconfig(machine_config &config)
{
	GENERIC_SOCKET(config, "rom1", generic_linear_slot, nullptr, "bin,rom");
	GENERIC_SOCKET(config, "rom2", generic_linear_slot, nullptr, "bin,rom");
	GENERIC_SOCKET(config, "rom3", generic_linear_slot, nullptr, "bin,rom");
	GENERIC_SOCKET(config, "rom4", generic_linear_slot, nullptr, "bin,rom");
	GENERIC_SOCKET(config, "rom5", generic_linear_slot, nullptr, "bin,rom");
	GENERIC_SOCKET(config, "rom6", generic_linear_slot, nullptr, "bin,rom");
	GENERIC_SOCKET(config, "rom7", generic_linear_slot, nullptr, "bin,rom");
	GENERIC_SOCKET(config, "rom8", generic_linear_slot, nullptr, "bin,rom");
}



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

//-------------------------------------------------
//  c64_rex_ep256_cartridge_device - constructor
//-------------------------------------------------

c64_rex_ep256_cartridge_device::c64_rex_ep256_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	device_t(mconfig, C64_REX_EP256, tag, owner, clock),
	device_c64_expansion_card_interface(mconfig, *this)
{
	for (int i = 0; i < 8; i++)
	{
		char str[6];
		sprintf(str, "rom%i", i + 1);
		m_eproms[i] = subdevice<generic_slot_device>(str);
	}
}


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

void c64_rex_ep256_cartridge_device::device_start()
{
	// state saving
	save_item(NAME(m_bank));
	save_item(NAME(m_reset));
	save_item(NAME(m_socket));
}


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

void c64_rex_ep256_cartridge_device::device_reset()
{
	m_exrom = 0;
	m_reset = 1;
	m_bank = 0;
	m_socket = 0;
}


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

uint8_t c64_rex_ep256_cartridge_device::c64_cd_r(address_space &space, offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
{
	if (!roml)
	{
		if (m_reset)
		{
			data = m_roml[offset & 0x1fff];
		}
		else
		{
			offs_t addr = (m_bank << 13) | (offset & 0x1fff);
			data = m_eproms[m_socket]->read_rom(space, addr);
		}
	}
	else if (!io2)
	{
		if ((offset & 0xf0) == 0xc0)
		{
			m_exrom = 1;
		}
		else if ((offset & 0xf0) == 0xe0)
		{
			m_exrom = 0;
		}
	}

	return data;
}


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

void c64_rex_ep256_cartridge_device::c64_cd_w(address_space &space, offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
{
	if (!io2 && ((offset & 0xf0) == 0xa0))
	{
		/*

		    bit     description

		    0       socket selection bit 0
		    1       socket selection bit 1
		    2       socket selection bit 2
		    3
		    4
		    5       bank selection bit 0
		    6       bank selection bit 1
		    7

		*/

		m_reset = 0;

		m_socket = data & 0x07;
		m_bank = (data >> 5) & 0x03;
	}
}