PS2 BIOS Checksum

Purpose

Help agents and developers inspect a local PlayStation 2 BIOS dump. Calculate MD5 and SHA-1, format size, and compare against common dump sizes (2 / 4 / 8 / 16 MiB).

This skill does not download, host, or distribute BIOS files. Matching a size or checksum is a reference check only — not proof a file is authentic or legal.

When to use

• User has a BIOS file path and wants checksums
• User wants to know if a file size looks like a common PS2 BIOS dump
• User is configuring RetroArch / PS2 emulator BIOS paths and needs verification helpers

Inputs

• path (required): absolute or workspace-relative path to a local file
• Optional expected MD5 or SHA-1 string for comparison

Procedure

1. Confirm the file exists and is readable.
2. Read the file locally (prefer streaming for large files; reject > 64 MiB unless the user insists).
3. Compute MD5 and SHA-1 hex digests.
4. Report size with a human-readable unit.
5. If size is 2, 4, 8, or 16 MiB, say Basic checks passed; otherwise report that size is unexpected.
6. If an expected hash was provided, compare case-insensitively after stripping non-hex characters.
7. Remind the user that results are on-device reference checks only.

Outputs

• file name / path
• size
• MD5
• SHA-1
• status summary
• optional compare result

Restrictions

• Do not fetch BIOS files from the internet.
• Do not claim a dump is official, genuine, or legal based on checksum alone.
• Do not provide Switch/Eden prod.keys or circumvention guidance.

Reference

RetroArch PS2 BIOS notes: https://allps2bios.com/ps2-bios-retroarch/