: If you are using an older version of MAME (pre-v181), this specific file will not be present in your BIOS sets, potentially causing "Missing ROM" errors for certain games. Installation : The file should typically be located within a compressed BIOS folder (such as ) inside your MAME directory. Technical Modification : For advanced users, this file is sometimes referenced in Arcade-Projects Forums
Without the data contained in ic655 , an emulator can't "understand" exactly how the original hardware processed certain inputs, leading to the "ROM not working" errors many enthusiasts encounter when setting up older versions of MAME. The Quest for Preservation 78081g503.ic655
This part number appears to be a specific reference for an Allen-Bradley/Rockwell Automation 1771-OBDN Output Module (or a compatible derivative). The suffix ic655 often refers to the General Electric Series Six/IC655 product line, suggesting this may be a legacy interface or a specific catalog entry for an 8-Point Discrete Output module. : If you are using an older version