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ymf278b.c: Added simple FM reg read back (nw)

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This commit is contained in:
Wilbert Pol 2015-07-19 10:22:52 +02:00
parent f1de898fba
commit e338cdaf85
2 changed files with 7 additions and 1 deletions
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7
src/emu/sound/ymf278b.c
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@ -690,6 +690,7 @@ WRITE8_MEMBER( ymf278b_device::write )
timer_busy_start(0); timer_busy_start(0);
if (m_lastport) B_w(m_port_AB, data); if (m_lastport) B_w(m_port_AB, data);
else A_w(m_port_AB, data); else A_w(m_port_AB, data);
m_last_fm_data = data;
break; break;
case 4: case 4:
@ -737,6 +738,8 @@ READ8_MEMBER( ymf278b_device::read )
case 1: case 1:
case 3: case 3:
// but they're not implemented here yet // but they're not implemented here yet
// This may be incorrect, but it makes the mbwave moonsound detection in msx drivers pass.
ret = m_last_fm_data;
break; break;
// PCM regs // PCM regs
@ -879,6 +882,7 @@ void ymf278b_device::register_save_state()
save_item(NAME(m_port_AB)); save_item(NAME(m_port_AB));
save_item(NAME(m_port_C)); save_item(NAME(m_port_C));
save_item(NAME(m_lastport)); save_item(NAME(m_lastport));
save_item(NAME(m_last_fm_data));
for (i = 0; i < 24; ++i) for (i = 0; i < 24; ++i)
{ {
@ -979,7 +983,8 @@ ymf278b_device::ymf278b_device(const machine_config &mconfig, const char *tag, d
device_sound_interface(mconfig, *this), device_sound_interface(mconfig, *this),
device_memory_interface(mconfig, *this), device_memory_interface(mconfig, *this),
m_space_config("samples", ENDIANNESS_BIG, 8, 22, 0, NULL), m_space_config("samples", ENDIANNESS_BIG, 8, 22, 0, NULL),
m_irq_handler(*this) m_irq_handler(*this),
m_last_fm_data(0)
{ {
m_address_map[0] = *ADDRESS_MAP_NAME(ymf278b); m_address_map[0] = *ADDRESS_MAP_NAME(ymf278b);
} }

1
src/emu/sound/ymf278b.h
View File

@ -131,6 +131,7 @@ private:
direct_read_data * m_direct; direct_read_data * m_direct;
const address_space_config m_space_config; const address_space_config m_space_config;
devcb_write_line m_irq_handler; devcb_write_line m_irq_handler;
UINT8 m_last_fm_data;
}; };
extern const device_type YMF278B; extern const device_type YMF278B;