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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
// license:BSD-3-Clause
// copyright-holders:Sandro Ronco
/***************************************************************************
rom.c
Z88 ROM cartridges emulation
***************************************************************************/
#include "emu.h"
#include "rom.h"
namespace {
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> z88_32k_rom_device
class z88_32k_rom_device : public device_t,
public device_nvram_interface,
public device_z88cart_interface
{
public:
// construction/destruction
z88_32k_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
z88_32k_rom_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
// device_t implementation
virtual void device_start() override ATTR_COLD;
// device_nvram_interface implementation
virtual void nvram_default() override
{
}
virtual bool nvram_read(util::read_stream &file) override
{
auto const [err, actual] = util::read(file, get_cart_base(), get_cart_size());
return !err && (actual == get_cart_size());
}
virtual bool nvram_write(util::write_stream &file) override
{
auto const [err, actual] = util::write(file, get_cart_base(), get_cart_size());
return !err;
}
virtual bool nvram_can_write() const override
{
return m_modified; // Save only if the EPROM has been programmed
}
// z88cart_interface implementation
virtual uint8_t read(offs_t offset) override;
virtual void write(offs_t offset, uint8_t data) override;
virtual void vpp_w(int state) override { m_vpp_state = state; }
virtual uint8_t* get_cart_base() override;
virtual uint32_t get_cart_size() override { return 0x8000; }
protected:
// internal state
uint8_t * m_rom;
int m_vpp_state;
bool m_modified;
};
// ======================> z88_128k_rom_device
class z88_128k_rom_device : public z88_32k_rom_device
{
public:
// construction/destruction
z88_128k_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
// z88cart_interface implementation
virtual uint32_t get_cart_size() override { return 0x20000; }
};
// ======================> z88_256k_rom_device
class z88_256k_rom_device : public z88_32k_rom_device
{
public:
// construction/destruction
z88_256k_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
// z88cart_interface implementation
virtual uint32_t get_cart_size() override { return 0x40000; }
};
/***************************************************************************
IMPLEMENTATION
***************************************************************************/
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// z88_32k_rom_device - constructor
//-------------------------------------------------
z88_32k_rom_device::z88_32k_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: z88_32k_rom_device(mconfig, Z88_32K_ROM, tag, owner, clock)
{
}
z88_32k_rom_device::z88_32k_rom_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, type, tag, owner, clock)
, device_nvram_interface(mconfig, *this)
, device_z88cart_interface(mconfig, *this)
, m_rom(nullptr)
, m_vpp_state(0)
, m_modified(false)
{
}
//-------------------------------------------------
// z88_128k_rom_device - constructor
//-------------------------------------------------
z88_128k_rom_device::z88_128k_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: z88_32k_rom_device(mconfig, Z88_128K_ROM, tag, owner, clock)
{
}
//-------------------------------------------------
// z88_256k_rom_device - constructor
//-------------------------------------------------
z88_256k_rom_device::z88_256k_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: z88_32k_rom_device(mconfig, Z88_256K_ROM, tag, owner, clock)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void z88_32k_rom_device::device_start()
{
m_rom = machine().memory().region_alloc(tag(), get_cart_size(), 1, ENDIANNESS_LITTLE)->base();
std::fill_n(m_rom, get_cart_size(), 0xff);
save_item(NAME(m_vpp_state));
save_item(NAME(m_modified));
}
/*-------------------------------------------------
get_cart_base
-------------------------------------------------*/
uint8_t* z88_32k_rom_device::get_cart_base()
{
return m_rom;
}
/*-------------------------------------------------
read
-------------------------------------------------*/
uint8_t z88_32k_rom_device::read(offs_t offset)
{
return m_rom[offset & (get_cart_size() - 1)];
}
/*-------------------------------------------------
write
-------------------------------------------------*/
void z88_32k_rom_device::write(offs_t offset, uint8_t data)
{
if (m_vpp_state)
{
const uint32_t offset_mask = get_cart_size() - 1;
if (m_rom[offset & offset_mask] & ~data)
m_modified = true;
m_rom[offset & offset_mask] &= data;
}
}
} // anonymous namespace
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DEFINE_DEVICE_TYPE_PRIVATE(Z88_32K_ROM, device_z88cart_interface, z88_32k_rom_device, "z88_32k_rom", "Z88 32KB ROM")
DEFINE_DEVICE_TYPE_PRIVATE(Z88_128K_ROM, device_z88cart_interface, z88_128k_rom_device, "z88_128k_rom", "Z88 128KB ROM")
DEFINE_DEVICE_TYPE_PRIVATE(Z88_256K_ROM, device_z88cart_interface, z88_256k_rom_device, "z88_256k_rom", "Z88 256KB ROM")
|