diff --git a/src/mame/drivers/mephisto_modular.cpp b/src/mame/drivers/mephisto_modular.cpp
index 5d458a3216d..c3734d7a089 100644
--- a/src/mame/drivers/mephisto_modular.cpp
+++ b/src/mame/drivers/mephisto_modular.cpp
@@ -533,7 +533,7 @@ ROM_END
 ROM_START( gen32 )
 	ROM_REGION32_BE( 0x40000, "maincpu", 0 )
 	ROM_SYSTEM_BIOS( 0, "v401", "V4.01" ) // V401 D1BB 5A88
-	ROMX_LOAD("gen32_41.bin", 0x00000, 0x40000, CRC(ea9938c0) SHA1(645cf0b5b831b48104ad6cec8d78c63dbb6a588c), ROM_BIOS(0) )
+	ROMX_LOAD("genius_68030_version_4.01", 0x00000, 0x40000, CRC(ea9938c0) SHA1(645cf0b5b831b48104ad6cec8d78c63dbb6a588c), ROM_BIOS(0) )
 	ROM_SYSTEM_BIOS( 1, "v400", "V4.00" ) // V400 3B95 5A88
 	ROMX_LOAD("gen32_4.bin",  0x00000, 0x40000, CRC(6cc4da88) SHA1(ea72acf9c67ed17c6ac8de56a165784aa629c4a1), ROM_BIOS(1) )
 
diff --git a/src/mame/drivers/mephisto_mondial68k.cpp b/src/mame/drivers/mephisto_mondial68k.cpp
index 472f1586ab3..0812dd1d535 100644
--- a/src/mame/drivers/mephisto_mondial68k.cpp
+++ b/src/mame/drivers/mephisto_mondial68k.cpp
@@ -226,8 +226,8 @@ void mondial68k_state::mondial68k(machine_config &config)
 
 ROM_START( mondl68k )
 	ROM_REGION16_BE( 0x1000000, "maincpu", 0 )
-	ROM_LOAD16_BYTE("68000xl-06-11-87-u.bin", 0x0000, 0x8000, CRC(aebe482a) SHA1(900c91ec836cd65e4cd38e50555976ab8064be41))
-	ROM_LOAD16_BYTE("68000xl-06-11-87-l.bin", 0x0001, 0x8000, CRC(564e32c5) SHA1(8c9df46bc5ced114e72fb663f1055d775b8e2e0b))
+	ROM_LOAD16_BYTE("68000xl_u_06.11.87", 0x0000, 0x8000, CRC(aebe482a) SHA1(900c91ec836cd65e4cd38e50555976ab8064be41) )
+	ROM_LOAD16_BYTE("68000xl_l_06.11.87", 0x0001, 0x8000, CRC(564e32c5) SHA1(8c9df46bc5ced114e72fb663f1055d775b8e2e0b) )
 ROM_END
 
 
diff --git a/src/mame/drivers/mephisto_montec.cpp b/src/mame/drivers/mephisto_montec.cpp
index 300fc794adf..3bccddca35e 100644
--- a/src/mame/drivers/mephisto_montec.cpp
+++ b/src/mame/drivers/mephisto_montec.cpp
@@ -520,9 +520,9 @@ INPUT_PORTS_END
 
 void mephisto_montec_state::montec(machine_config &config)
 {
-	M65C02(config, m_maincpu, XTAL(4'000'000));
+	M65C02(config, m_maincpu, XTAL(8'000'000) / 2);
 	m_maincpu->set_addrmap(AS_PROGRAM, &mephisto_montec_state::montec_mem);
-	m_maincpu->set_periodic_int(FUNC(mephisto_montec_state::nmi_line_assert), attotime::from_hz(XTAL(4'000'000) / (1 << 13)));
+	m_maincpu->set_periodic_int(FUNC(mephisto_montec_state::nmi_line_assert), attotime::from_hz(XTAL(8'000'000) / (1 << 14)));
 
 	NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0);
 
diff --git a/src/mame/drivers/mephisto_polgar.cpp b/src/mame/drivers/mephisto_polgar.cpp
index 968b2e5f460..4e056758454 100644
--- a/src/mame/drivers/mephisto_polgar.cpp
+++ b/src/mame/drivers/mephisto_polgar.cpp
@@ -7,7 +7,6 @@ Mephisto Polgar and RISC
 The chess engine in Mephisto Risc is also compatible with Tasc's The ChessMachine.
 
 TODO:
-- Mephisto Risc maincpu is maybe 5MHz? but LCD doesn't like it
 - split driver into several files? mrisc for example is completely different hw
 
 **************************************************************************************************/