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measured Naomi's MIE MCU speed [rtw, MetalliC]

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MetalliC 2017-03-21 22:51:10 +02:00
parent ed1d22231b
commit c65634ec72
1 changed files with 4 additions and 2 deletions
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6
src/mame/drivers/naomi.cpp
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@ -2719,8 +2719,10 @@ static MACHINE_CONFIG_START( naomi_base, naomi_state )
MCFG_EEPROM_SERIAL_93C46_ADD("main_eeprom")
MCFG_EEPROM_SERIAL_DEFAULT_VALUE(0)
MCFG_MIE_ADD("mie", XTAL_32MHz/2, "maple_dc", 0, nullptr, nullptr, nullptr, ":MIE.3", nullptr, ":MIE.5", nullptr, nullptr) // Actual frequency unknown, most likely 1/2 of 32MHz XTAL or even 2/3 (yes, 21MHz Z80 core)
// clock was measured using GPIO (13.499Mhz) and UART (13.260MHz) access
// IO ports access may have latency so actual CPU core clock can be higher, possible OSC3 14.7456MHz
MCFG_MIE_ADD("mie", 13500000, "maple_dc", 0, nullptr, nullptr, nullptr, ":MIE.3", nullptr, ":MIE.5", nullptr, nullptr)
MCFG_SEGA_837_13551_DEVICE_ADD("837_13551", "mie", ":TILT", ":P1", ":P2", ":A0", ":A1", ":A2", ":A3", ":A4", ":A5", ":A6", ":A7", ":OUTPUT")
MCFG_EEPROM_SERIAL_93C46_8BIT_ADD("mie_eeprom")