Utility:  YY-CHR.NET - NES Konami RLE Viewer Plugin
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Last updated:  July 22, 2025
Downloads:  48
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The last releases of YY-CHR (C++ version) included a plugin called 2BPP NES (KONAMI-S), which allowed users to view (but not edit) NES graphics compressed with Konami’s run-length encoding (RLE). This plugin, however, did not get remade for YY-CHR.NET (C# version).

As such, this release brings a recreation of that plugin (using the plugin code template shared by YY) to YY-CHR.NET, along with adding new features, such as:

  • Usage of a 128×256 bitmap (split into two 128×128 bitmaps) in order to handle and display all the decompressed data.
  • Data decompression and display options (ignore data’s end bytes, change empty bitmap area’s color, etc) available via keyboard combinations.
  • Information about the decompressed graphics (size in bytes, PPU address, data’s end type).

This compression format appears in many of Konami’s Famicom Disk System / NES (CHR-RAM) games, such as:

  • Contra (USA) / Probotector (Europe)
  • Salamander (Japan) / Life Force (USA / Europe)
  • The Goonies II (All regions)
  • Ai Senshi Nicol (Japan, FDS)
  • Rampart (Japan)
  • Lagrange Point (Japan)

The download includes both the source code and the compiled DLL. For more information about the plugin, please check the READ ME file.

Please note that this plugin is exclusively for viewing compressed graphics. Due to some limitations, implementing data recompression wasn’t possible with YY-CHR.NET.

Staff/Credits: 
• Mister Man: Plugin development.
• YY: Besides creating both YY-CHR and YY-CHR.NET, also shared the plugin code template through his website's official bulletin.
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I wish this was available sooner… I love this plugin!

Written by: BlackPaladin - April 29, 2025

This plugin is a godsend when it comes to looking up compressed Konami RLE graphics!  This would've made looking up graphics in my old Dracula 2 and Nicol projects easier to find the necessary graphics at the time.  However, it does help me look for the area where I need to decompress.  (I only wish it was possible to edit directly in YY-CHR via this plugin, but any port in a storm.)

Thank you so much for adding this plugin to YY-CHR!

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