BIOS firmware for a Sony VAIO laptop on the MBX-256 motherboard, using Sony's own MBX board numbering. The name gives no revision or flash chip detail, so check the MBX number and any revision label on the PCB before using the image. Technicians write such dumps with an SPI programmer to recover a board that is stuck on a blank screen or has a corrupted BIOS. Read and keep the original chip contents, since they may include unit data, and confirm the image size matches the flash capacity.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @biosarchive. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →