Op wolf chips

mike11

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These boards use (3) nec chips ..... Boards screened MN234000....... What is that ?? I can't find a data sheet for it...... Memory ?? Rom ect ? I have 2 sets of boards here mixing and matching them I got one to boot but still am 1 short for the sound board..
 
The MN23C400 is a 40 pin 4Mbit (512k x 8) MASK ROM whose pinout is compatible with the 27C400 EPROM.So, you have to replace them with 27C400.
 
The MN23C400 is a 40 pin 4Mbit (512k x 8) MASK ROM whose pinout is compatible with the 27C400 EPROM.So, you have to replace them with 27C400.

next prob comes where with all the rom file pack i downloaded none of them i saw had files for this chip or location... anyone know where to get them ?? i believe my sound one is corrupt
 
MAME source is you friend :

ROM_REGION( 0x80000, "gfx1", 0 )
ROM_LOAD( "b20-13.13", 0x00000, 0x80000, CRC(f6acdab1) SHA1(716b94ab3fa330ecf22df576f6a9f47a49c7554a) ) /* SCR tiles (8 x 8) */

ROM_REGION( 0x80000, "gfx2", 0 )
ROM_LOAD( "b20-14.72", 0x00000, 0x80000, CRC(89f889e5) SHA1(1592f6ce4fbb75e33d6ab957e5b90242a7a7a8c4) ) /* Sprites (16 x 16) */

ROM_REGION( 0x80000, "adpcm", 0 ) /* ADPCM samples */
ROM_LOAD( "b20-08.21", 0x00000, 0x80000, CRC(f3e19c64) SHA1(39d48645f776c9c2ade537d959ecc6f9dc6dfa1b) )


These are the three 4Mbit MASK ROM, the one containing ADPCM samples is the 'b20-08.21' one so download the set.
Do you have bad sound FXs or music or both?
 
Last edited:
MAME source is you friend :

ROM_REGION( 0x80000, "gfx1", 0 )
ROM_LOAD( "b20-13.13", 0x00000, 0x80000, CRC(f6acdab1) SHA1(716b94ab3fa330ecf22df576f6a9f47a49c7554a) ) /* SCR tiles (8 x 8) */

ROM_REGION( 0x80000, "gfx2", 0 )
ROM_LOAD( "b20-14.72", 0x00000, 0x80000, CRC(89f889e5) SHA1(1592f6ce4fbb75e33d6ab957e5b90242a7a7a8c4) ) /* Sprites (16 x 16) */

ROM_REGION( 0x80000, "adpcm", 0 ) /* ADPCM samples */
ROM_LOAD( "b20-08.21", 0x00000, 0x80000, CRC(f3e19c64) SHA1(39d48645f776c9c2ade537d959ecc6f9dc6dfa1b) )


These are the three 4Mbit MASK ROM, the one containing ADPCM samples is the 'b20-08.21' one so download the set.
Do you have bad sound FXs or music or both?

That's all Greek to me ..... Music tune is there ... Some garbage is mixed in n some sounds are missing
 
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