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jangou.cpp: updated luckygrl decryption. Plaintext seems correct, but needs quite a lot more work. (nw)

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Ivan Vangelista 2018-05-18 08:41:22 +02:00 committed by GitHub
parent 64486afe62
commit 3486171aef
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 33 additions and 27 deletions
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60
src/mame/drivers/jangou.cpp
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@ -56,6 +56,20 @@ public:
{
}
void jngolady(machine_config &config);
void roylcrdn(machine_config &config);
void cntrygrl(machine_config &config);
void jangou(machine_config &config);
void init_jngolady();
void init_luckygrl();
protected:
virtual void machine_start() override;
virtual void machine_reset() override;
virtual void video_start() override;
private:
/* sound-related */
// Jangou CVSD Sound
emu_timer *m_cvsd_bit_timer;
@ -70,6 +84,8 @@ public:
uint8_t m_nsc_latch;
uint8_t m_z80_latch;
std::unique_ptr<bitmap_ind16> m_tmp_bitmap;
/* devices */
required_device<cpu_device> m_cpu_0;
optional_device<cpu_device> m_cpu_1;
@ -94,11 +110,7 @@ public:
DECLARE_READ8_MEMBER(jngolady_rng_r);
DECLARE_READ8_MEMBER(input_mux_r);
DECLARE_READ8_MEMBER(input_system_r);
void init_jngolady();
void init_luckygrl();
virtual void machine_start() override;
virtual void machine_reset() override;
virtual void video_start() override;
DECLARE_PALETTE_INIT(jangou);
DECLARE_MACHINE_START(jngolady);
DECLARE_MACHINE_RESET(jngolady);
@ -108,11 +120,6 @@ public:
TIMER_CALLBACK_MEMBER(cvsd_bit_timer_callback);
DECLARE_WRITE_LINE_MEMBER(jngolady_vclk_cb);
std::unique_ptr<bitmap_ind16> m_tmp_bitmap;
void jngolady(machine_config &config);
void roylcrdn(machine_config &config);
void cntrygrl(machine_config &config);
void jangou(machine_config &config);
void cntrygrl_cpu0_io(address_map &map);
void cntrygrl_cpu0_map(address_map &map);
void cpu0_io(address_map &map);
@ -1251,29 +1258,28 @@ void jangou_state::init_jngolady()
void jangou_state::init_luckygrl()
{
// this is WRONG
// this is WRONG, plaintext in the 0x1800 - 0x1dff range
uint8_t *ROM = memregion("cpu0")->base();
unsigned char patn1[32] = {
0x00, 0xA0, 0x00, 0xA0, 0x00, 0xA0, 0x00, 0xA0, 0x00, 0xA0, 0x00, 0xA0, 0x00, 0xA0, 0x00, 0xA0,
0x88, 0x28, 0x88, 0x28, 0x88, 0x28, 0x88, 0x28, 0x88, 0x28, 0x88, 0x28, 0x88, 0x28, 0x88, 0x28,
};
unsigned char patn2[32] = {
0x28, 0x20, 0x28, 0x20, 0x28, 0x20, 0x28, 0x20, 0x28, 0x20, 0x28, 0x20, 0x28, 0x20, 0x28, 0x20,
0x28, 0x88, 0x28, 0x88, 0x28, 0x88, 0x28, 0x88, 0x28, 0x88, 0x28, 0x88, 0x28, 0x88, 0x28, 0x88
};
for (int A = 0; A < 0x3000; A++)
{
uint8_t dat = ROM[A];
if (A&0x100) dat = dat ^ patn2[A & 0x1f];
else dat = dat ^ patn1[A & 0x1f];
uint8_t x = ROM[A];
ROM[A] = dat;
switch(A & 0x111)
{
case 0x000: x = bitswap<8>(x ^ 0x00, 7, 6, 5, 4, 3, 2, 1, 0); break;
case 0x001: x = bitswap<8>(x ^ 0xa0, 3, 6, 5, 4, 7, 2, 1, 0); break;
case 0x010: x = bitswap<8>(x ^ 0x88, 7, 6, 5, 4, 3, 2, 1, 0); break;
case 0x011: x = bitswap<8>(x ^ 0x28, 7, 6, 3, 4, 5, 2, 1, 0); break;
case 0x100: x = bitswap<8>(x ^ 0x28, 7, 6, 3, 4, 5, 2, 1, 0); break;
case 0x101: x = bitswap<8>(x ^ 0x20, 7, 6, 5, 4, 3, 2, 1, 0); break;
case 0x110: x = bitswap<8>(x ^ 0x28, 3, 6, 5, 4, 7, 2, 1, 0); break;
case 0x111: x = bitswap<8>(x ^ 0x88, 7, 6, 5, 4, 3, 2, 1, 0); break;
}
ROM[A] = x;
}
#if 0
{
char filename[256];
@ -1305,7 +1311,7 @@ GAME( 1984, fruitbun, cntrygrl, cntrygrl, cntrygrl, jangou_state, empty_init,
GAME( 1985, roylcrdn, 0, roylcrdn, roylcrdn, jangou_state, empty_init, ROT0, "Nichibutsu", "Royal Card (Nichibutsu)", MACHINE_SUPPORTS_SAVE )
/* The following might not run there... */
GAME( 1984?, luckygrl, 0, cntrygrl, cntrygrl, jangou_state, init_luckygrl, ROT0, "Wing Co., Ltd.", "Lucky Girl? (Wing)", MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE )
GAME( 1985, luckygrl, 0, cntrygrl, cntrygrl, jangou_state, init_luckygrl, ROT0, "Wing Co., Ltd.", "Lucky Girl? (Wing)", MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE )
/*
Some other games that might run on this HW: