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Diffstat (limited to 'src/mame/drivers/system16.cpp')
-rw-r--r--src/mame/drivers/system16.cpp8
1 files changed, 5 insertions, 3 deletions
diff --git a/src/mame/drivers/system16.cpp b/src/mame/drivers/system16.cpp
index b65582e8a86..cc28c11e0ef 100644
--- a/src/mame/drivers/system16.cpp
+++ b/src/mame/drivers/system16.cpp
@@ -487,7 +487,8 @@ WRITE8_MEMBER(segas1x_bootleg_state::upd7759_bank_w)//*
{
int offs, size = m_soundcpu_region->bytes() - 0x10000;
- m_upd7759->reset_w(data & 0x40);
+ m_upd7759->start_w(BIT(data, 7));
+ m_upd7759->reset_w(BIT(data, 6));
offs = 0x10000 + (data * 0x4000) % size;
membank("bank1")->set_base(m_soundcpu_region->base() + offs);
}
@@ -2076,8 +2077,8 @@ MACHINE_CONFIG_END
WRITE_LINE_MEMBER(segas1x_bootleg_state::sound_cause_nmi)
{
- /* upd7759 callback */
- m_soundcpu->pulse_input_line(INPUT_LINE_NMI, attotime::zero);
+ if (state)
+ m_soundcpu->pulse_input_line(INPUT_LINE_NMI, attotime::zero);
}
MACHINE_CONFIG_START(segas1x_bootleg_state::z80_ym2151_upd7759)
@@ -2095,6 +2096,7 @@ MACHINE_CONFIG_START(segas1x_bootleg_state::z80_ym2151_upd7759)
MCFG_SOUND_ROUTE(1, "rspeaker", 0.32)
MCFG_DEVICE_ADD("7759", UPD7759)
+ MCFG_UPD7759_MD(0)
MCFG_UPD7759_DRQ_CALLBACK(WRITELINE(*this, segas1x_bootleg_state,sound_cause_nmi))
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "lspeaker", 0.48)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "rspeaker", 0.48)