igs/igs_fear.cpp - add IGS027A dump to fearless [tormod, Peter Wilhel…

…msen, XingXing] (#12553) * correct clock for XA igs/pgmcrypt.cpp - properly fix fearless decryption --------- Co-authored-by: DavidHaywood <[email protected]>
mamedev · Jul 9, 2024 · d20ef20 · d20ef20
1 parent df064c5
commit d20ef20
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Showing 2 changed files with 4 additions and 5 deletions.
diff --git a/src/mame/igs/igs_fear.cpp b/src/mame/igs/igs_fear.cpp
@@ -139,7 +139,7 @@ void igs_fear_state::igs_fear(machine_config &config)
 	ARM7(config, m_maincpu, 50000000/2);
 	m_maincpu->set_addrmap(AS_PROGRAM, &igs_fear_state::main_map);
 
-	MX10EXA(config, m_xa, 10000000); // MX10EXAQC (Philips 80C51 XA) unknown frequency
+	MX10EXA(config, m_xa, 50000000/3); // MX10EXAQC (Philips 80C51 XA)
 
 	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
 	screen.set_refresh_hz(60);
@@ -162,8 +162,7 @@ void igs_fear_state::igs_fear(machine_config &config)
 
 ROM_START( fearless )
 	ROM_REGION( 0x04000, "maincpu", 0 ) // Internal rom of IGS027A ARM based MCU
-	// this is taken from superkds, the XOR table required (that is uploaded by this internal ROM) is the same as superkds at least, but actual internal ROM might not be identical
-	ROM_LOAD( "fearless_igs027a.bin", 0x00000, 0x4000, BAD_DUMP CRC(9a8e790d) SHA1(ab020a04a4ed0c0e5ec8c979f206fe57572d2304) ) // sticker marked 'F1'
+	ROM_LOAD( "fearless_igs027a.bin", 0x00000, 0x4000, CRC(2121f01b) SHA1(de44016b590fdcf6bfb63e3f8dbbbd679938fe87) ) // sticker marked 'F1'
 
 	ROM_REGION32_LE( 0x80000, "user1", 0 ) // external ARM data / prg
 	ROM_LOAD( "fearlessp_v-101us.u37", 0x000000, 0x80000, CRC(2522873c) SHA1(8db709877311b6d2796353fc9a44a820937e35c2) )

diff --git a/src/mame/igs/pgmcrypt.cpp b/src/mame/igs/pgmcrypt.cpp
@@ -1453,8 +1453,8 @@ void fearless_decrypt(running_machine &machine)
 		uint16_t x = src[i];
 
 		IGS27_CRYPT1
-		IGS27_CRYPT2_ALT
-		IGS27_CRYPT3
+		// IGS27_CRYPT2
+		IGS27_CRYPT3_ALT2
 		IGS27_CRYPT4
 		// IGS27_CRYPT5
 		IGS27_CRYPT6