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SPECIFICTION
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BPS Super Mario Bros. 2 Patcher

producks.github.io

Web
Visit producks.github.io
Spec score 7.5 #9 of 20 in ROM Patching Software

What it is

BPS Super Mario Bros. 2 Patcher is a free web page for applying a BPS patch to a Super Mario Bros. 2 ROM. It provides separate upload controls for an SMB2 ROM and a BPS patch, then an Apply patch button. The page validates both files and shows invalid-file messages when they are rejected. It supports only the NTSC version; the page says an invalid ROM may be a bad dump or the wrong region. During validation, the code checks iNES 1.0 and iNES 2.0 headers and can swap them as needed. It recognizes ROM and patch checksums for revisions 0 and A, and can apply a revision conversion patch. After patching, the script saves a .nes file named from the patch filename. The project links to GitHub source code containing BPS handling, ROM and hash code, revision patches, scripts and styles. The page credits Marc Robledo for Rom patcher JS.

Spec sheet

Purpose
The patcher applies a BPS patch to a Super Mario Bros. 2 ROM.Read 5 Oct 2026 · producks.github.io
Apply patch
The page provides an Apply patch button.Read 5 Oct 2026 · producks.github.io
Attribution
The page attributes the ROM patcher JavaScript to Marc Robledo.Read 5 Oct 2026 · producks.github.io
Browser access
The project is presented as a web page with file upload controls and an Apply patch button.Read 5 Oct 2026 · producks.github.io
Header adjustment
The patcher automatically adapts the iNES header to match the BPS patch.Read 5 Oct 2026 · producks.github.io
Header handling
The maker’s code checks and swaps iNES 1.0 and iNES 2.0 headers while validating the ROM.Read 5 Oct 2026 · github.com
Inputs
The page provides separate upload controls for an SMB2 ROM and a BPS patch.Read 5 Oct 2026 · producks.github.io
Interface attribution
The patcher page credits Marc Robledo for Rom patcher JS.Read 5 Oct 2026 · producks.github.io
Invalid ROMs
The page says an invalid ROM may be a bad dump or the wrong region.Read 5 Oct 2026 · producks.github.io
Limits
The patcher page specifies NTSC support and provides an SMB2 BPS patch upload control.Read 5 Oct 2026 · producks.github.io
Maker profile
Marc Robledo describes himself as a computer engineer.Read 5 Oct 2026 · marcrobledo.com
Output
After applying the patch, the script saves the result with a .nes filename based on the patch filename.Read 5 Oct 2026 · github.com
Patch input
The page lets users upload a BPS patch.Read 5 Oct 2026 · producks.github.io
Region limit
The patcher only supports the NTSC version.Read 5 Oct 2026 · producks.github.io
Revision handling
The code recognizes ROM and patch checksums for revisions 0 and A, and can apply a revision conversion patch.Read 5 Oct 2026 · github.com
ROM input
The page lets users upload an SMB2 ROM.Read 5 Oct 2026 · producks.github.io
ROM region
The patcher supports only the NTSC version; it says an invalid ROM may be a bad dump or the wrong region.Read 5 Oct 2026 · producks.github.io
ROM revision adjustment
The patcher automatically adapts the ROM revision to match the BPS patch.Read 5 Oct 2026 · producks.github.io
Source code
The project page links to its source code on GitHub.Read 5 Oct 2026 · producks.github.io
Source files
The GitHub repository includes BPS handling code, ROM file and hash code, two revision patch files, and the page script and styles.Read 5 Oct 2026 · github.com
Validation
The patcher checks uploaded ROM and BPS patch files and displays invalid-file messages when they are not accepted.Read 5 Oct 2026 · producks.github.io

Strong points and limits

Strong points

  • Free web access
  • Separate ROM and patch uploads
  • Checks uploaded files
  • Adjusts headers and revisions
  • Saves a .nes output file

Limits

  • NTSC version only
  • No batch patching
  • No command-line support

Who it suits

It suits people who need to apply a BPS patch to an NTSC Super Mario Bros. 2 ROM in a browser. Users should have separate ROM and patch files ready for upload.

Verdict

This is a focused browser patcher for NTSC Super Mario Bros. 2 ROMs and BPS files. Its validation and automatic header and revision handling reduce manual preparation, but the tool has no batch or command-line mode.

Where Specifiction places it

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