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rugby: Further decryption (nw)

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This commit is contained in:
AJR 2018-03-30 16:36:25 -04:00
parent 20c7f769e1
commit bdc4288fe1
1 changed files with 25 additions and 1 deletions
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26
src/mame/drivers/4roses.cpp
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@ -190,14 +190,23 @@ class _4roses_state : public funworld_state
{
public:
_4roses_state(const machine_config &mconfig, device_type type, const char *tag)
: funworld_state(mconfig, type, tag) { }
: funworld_state(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
{
}
DECLARE_DRIVER_INIT(4roses);
DECLARE_DRIVER_INIT(rugby);
void _4roses(machine_config &config);
void rugby(machine_config &config);
private:
DECLARE_READ8_MEMBER(rugby_opcode_r);
void _4roses_map(address_map &map);
void rugby_map(address_map &map);
void rugby_opcodes_map(address_map &map);
required_device<cpu_device> m_maincpu;
};
@ -235,6 +244,20 @@ void _4roses_state::rugby_map(address_map &map)
map(0x4000, 0xffff).rom().region("maincpu", 0x4000);
}
READ8_MEMBER(_4roses_state::rugby_opcode_r)
{
uint8_t data = m_maincpu->space(AS_PROGRAM).read_byte(offset);
if ((offset >> 12) == 4)
data = bitswap<8>(data ^ 0xae, 2, 3, 0, 5, 6, 4, 7, 1);
return data;
}
void _4roses_state::rugby_opcodes_map(address_map &map)
{
map(0x0000, 0x7fff).r(this, FUNC(_4roses_state::rugby_opcode_r));
map(0x8000, 0xffff).rom().region("maincpu", 0x8000);
}
/*
Unknown R/W
-----------
@ -414,6 +437,7 @@ MACHINE_CONFIG_START(_4roses_state::rugby)
_4roses(config);
MCFG_CPU_MODIFY("maincpu")
MCFG_CPU_PROGRAM_MAP(rugby_map)
MCFG_CPU_OPCODES_MAP(rugby_opcodes_map)
MACHINE_CONFIG_END