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nichibutsu/nichild.cpp: pinpoint soundlatch clear

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This commit is contained in:
angelosa 2023-11-27 23:47:25 +01:00
parent 60cd99810d
commit 90c350ee22
1 changed files with 7 additions and 2 deletions
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9
src/mame/nichibutsu/nichild.cpp
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@ -13,7 +13,6 @@ TODO:
- V9938 has issues with layer clears, has an hard time sending a vblank irq (the only one enabled)
at the right time. Removing the invert() from the int_cb will "fix" it at the expense of being
excruciatingly slow.
- Complete audio section, SFXs keeps ringing;
- Document meaning of DIP switches
===================================================================================================
@ -114,6 +113,7 @@ private:
uint32_t m_gfx_bank = 0;
uint8_t m_key_select = 0;
uint8_t m_soundlatch_ack = 0;
int m_dsw_data = 0;
};
@ -222,7 +222,12 @@ void nichild_state::main_io(address_map &map)
void nichild_state::soundbank_w(uint8_t data)
{
m_soundbank->set_entry(data & 0x03);
// TODO: bit 7 used often with 0 -> 1 transitions
// 1 -> 0 -> 1 transitions clears the soundlatch
if (!BIT(data, 7) && BIT(m_soundlatch_ack, 7))
m_soundlatch->clear_w();
m_soundlatch_ack = data & 0x80;
if (data & 0x7c)
logerror("soundbank_w: %02x\n", data);
}