diff options
author | 2017-03-21 22:51:10 +0200 | |
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committer | 2017-03-21 22:51:10 +0200 | |
commit | c65634ec7208bd3bdecc3fd138270af40df3fd64 (patch) | |
tree | d476f580b7d00209d61b8d3670dc9be2c6ae82ec | |
parent | ed1d22231ba769cfda8dde16ace2aefd291964df (diff) |
measured Naomi's MIE MCU speed [rtw, MetalliC]
-rw-r--r-- | src/mame/drivers/naomi.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/mame/drivers/naomi.cpp b/src/mame/drivers/naomi.cpp index 89f261779c5..6354d008b21 100644 --- a/src/mame/drivers/naomi.cpp +++ b/src/mame/drivers/naomi.cpp @@ -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") |