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Simplified ADPCM write: No need for nibble swap

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This commit is contained in:
darq 2016-12-08 17:31:06 +01:00
parent 34474bf869
commit 129b9d7b99
1 changed files with 5 additions and 4 deletions
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9
src/mame/drivers/yunsung8.cpp
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@ -64,6 +64,7 @@ READ8_MEMBER(yunsung8_state::sound_command_r)
WRITE8_MEMBER (yunsung8_state::sound_command_w) WRITE8_MEMBER (yunsung8_state::sound_command_w)
{ {
m_soundlatch->write (space, 0, data);
m_audiocpu->set_input_line (0, ASSERT_LINE); m_audiocpu->set_input_line (0, ASSERT_LINE);
} }
@ -118,8 +119,7 @@ WRITE8_MEMBER(yunsung8_state::sound_bankswitch_w)
WRITE8_MEMBER(yunsung8_state::adpcm_w) WRITE8_MEMBER(yunsung8_state::adpcm_w)
{ {
/* Swap the nibbles */ m_adpcm = data;
m_adpcm = ((data & 0xf) << 4) | ((data >> 4) & 0xf);
} }
@ -457,10 +457,11 @@ GFXDECODE_END
WRITE_LINE_MEMBER(yunsung8_state::adpcm_int) WRITE_LINE_MEMBER(yunsung8_state::adpcm_int)
{ {
m_msm->data_w(m_adpcm >> 4); m_msm->data_w(m_adpcm & 0x0F);
m_adpcm <<= 4; m_adpcm >>= 4;
m_toggle ^= 1; m_toggle ^= 1;
if (m_toggle) if (m_toggle)
m_audiocpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE); m_audiocpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE);
} }