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bigkarnk: Adjust YM3812 clock so pitch matches reference recording

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This commit is contained in:
AJR 2019-10-05 16:13:44 -04:00
parent 0b72efe507
commit 5a79e134fb
1 changed files with 3 additions and 2 deletions
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5
src/mame/drivers/gaelco.cpp
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@ -635,10 +635,11 @@ void gaelco_state::machine_start()
m_okibank->configure_entries(0, 16, memregion("oki")->base(), 0x10000);
}
// TODO: verify all clocks (XTALs are 8867.23 kHz and 24.000 MHz)
void gaelco_state::bigkarnk(machine_config &config)
{
/* basic machine hardware */
M68000(config, m_maincpu, 10000000); /* MC68000P10, 10 MHz */
M68000(config, m_maincpu, 10000000); /* MC68000P10, 10 MHz? */
m_maincpu->set_addrmap(AS_PROGRAM, &gaelco_state::bigkarnk_map);
m_maincpu->set_vblank_int("screen", FUNC(gaelco_state::irq6_line_hold));
@ -673,7 +674,7 @@ void gaelco_state::bigkarnk(machine_config &config)
GENERIC_LATCH_8(config, m_soundlatch);
m_soundlatch->data_pending_callback().set_inputline(m_audiocpu, M6809_FIRQ_LINE);
YM3812(config, "ymsnd", 3580000).add_route(ALL_OUTPUTS, "mono", 1.0);
YM3812(config, "ymsnd", 24_MHz_XTAL / 6).add_route(ALL_OUTPUTS, "mono", 1.0); // 4 MHz matches PCB recording
OKIM6295(config, "oki", 1056000, okim6295_device::PIN7_HIGH).add_route(ALL_OUTPUTS, "mono", 1.0); // clock frequency & pin 7 not verified
}