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
|
// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
/******************************************************************************
Banking for Love Plus Pack 0, Korean 83-in-1 pirate.
******************************************************************************/
#include "emu.h"
#include "loveplus.h"
namespace {
class msx_cart_loveplus_device : public device_t, public msx_cart_interface
{
public:
msx_cart_loveplus_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, MSX_CART_LOVEPLUS, tag, owner, clock)
, msx_cart_interface(mconfig, *this)
, m_rombank(*this, "rombank%u", 0U)
{ }
virtual std::error_condition initialize_cartridge(std::string &message) override;
protected:
// device_t implementation
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
private:
template <int Bank> void bank_w(u8 data);
void bank_9000_w(u8 data);
memory_bank_array_creator<4> m_rombank;
u8 m_bank_mask;
bool m_bank_locked[4];
};
void msx_cart_loveplus_device::device_start()
{
save_item(NAME(m_bank_locked));
}
void msx_cart_loveplus_device::device_reset()
{
m_rombank[0]->set_entry(0);
m_rombank[1]->set_entry(1);
m_rombank[2]->set_entry(2);
m_rombank[3]->set_entry(3);
}
std::error_condition msx_cart_loveplus_device::initialize_cartridge(std::string &message)
{
if (!cart_rom_region())
{
message = "msx_cart_loveplus_device: Required region 'rom' was not found.";
return image_error::INTERNAL;
}
const u32 size = cart_rom_region()->bytes();
const u16 banks = size / 0x2000;
if (size > 256 * 0x8000 || size < 0x10000 || size != banks * 0x2000 || (~(banks - 1) % banks))
{
message = "msx_cart_loveplus_device: Region 'rom' has unsupported size.";
return image_error::INVALIDLENGTH;
}
m_bank_mask = banks - 1;
m_rombank[0]->configure_entries(0, banks, cart_rom_region()->base(), 0x2000);
m_rombank[1]->configure_entries(0, banks, cart_rom_region()->base(), 0x2000);
m_rombank[2]->configure_entries(0, banks, cart_rom_region()->base(), 0x2000);
m_rombank[3]->configure_entries(0, banks, cart_rom_region()->base(), 0x2000);
page(1)->install_read_bank(0x4000, 0x5fff, m_rombank[0]);
page(1)->install_read_bank(0x6000, 0x7fff, m_rombank[1]);
page(1)->nop_write(0x5000, 0x5000); // Referenced from code but never used
page(1)->install_write_handler(0x6000, 0x6000, emu::rw_delegate(*this, FUNC(msx_cart_loveplus_device::bank_w<0>)));
page(1)->install_write_handler(0x6800, 0x6800, emu::rw_delegate(*this, FUNC(msx_cart_loveplus_device::bank_w<1>)));
page(1)->install_write_handler(0x7000, 0x7000, emu::rw_delegate(*this, FUNC(msx_cart_loveplus_device::bank_w<2>)));
page(1)->install_write_handler(0x7800, 0x7800, emu::rw_delegate(*this, FUNC(msx_cart_loveplus_device::bank_w<3>)));
page(2)->install_read_bank(0x8000, 0x9fff, m_rombank[2]);
page(2)->install_read_bank(0xa000, 0xbfff, m_rombank[3]);
page(2)->install_write_handler(0x9000, 0x9000, emu::rw_delegate(*this, FUNC(msx_cart_loveplus_device::bank_9000_w)));
page(2)->nop_write(0xb000, 0xb000); // Referenced from code but never used
return std::error_condition();
}
template <int Bank>
void msx_cart_loveplus_device::bank_w(u8 data)
{
// The banking registers can be only written to once otherwise Q-Bert will not
// start and drop back to Basic.
if (!m_bank_locked[Bank])
{
m_rombank[Bank]->set_entry(data & m_bank_mask);
m_bank_locked[Bank] = true;
}
}
void msx_cart_loveplus_device::bank_9000_w(u8 data)
{
// Before switching to a game the sequence 00, 3f, c2 is written here.
// This unlocks and/or configures the write-once banking somehow
for (int i = 0; i < 4; i++)
m_bank_locked[i] = false;
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_LOVEPLUS, msx_cart_interface, msx_cart_loveplus_device, "msx_cart_loveplus", "MSX Cartridge - Love Plus Pack")
|