Grandia (PS1) ROM editor by: Tony H
Version 1.0  8/16/2026
For Windows   (C#)

Send bug reports or comments to: t_hedstrom@yahoo.com

My site, with other programs, editors, Game Genie codes, etc...
https://codehut.gshi.org/
My Discord link can be found on my site (home page).

Version 1.0 = Initial public release  (8/16/2026)


This is a ROM/ISO editor for the USA version of Grandia 1 on the PlayStation 1.  The correct serial number is: SCUS-94457

The editor does not make a backup copy of your ROM/ISO, so make sure to make your own copy if you want one.

This editor does PS1 editing a little different than my previous PS1 editors.  When you open your PS1 ROM, it removes all of the Error Correction Code (ECC) used on the disc.  What's left is 100% of the game data, which makes editing much easier.  This temporary stripped down ROM is what you'll actually be editing.  The ECC data was used to try and fix any errors on the disc (most likely because of scratches).  When you're finished editing, the editor will rebuild your ROM with everything you edited.  I've tested an edited ROM with DuckStation, No$PSX, and Psxjin and didn't have any problems.  Although it hasn't been tested with this specific editor, I've been told that Mednafen in general may not like it if the ECC data doesn't match the newly edited sector checksum values.

When patching Spells, Skills, or Items, there are 44 occurrences that will get patched in the ROM.  I'm pretty sure that these are for different areas in the game.  The editor will tell you how many got patched.  It should always be 44, but there are over 500 items and I haven't tested them all.

For now, the editor only works on disc 1.

Here's a link with some detailed info on the editor:

https://www.romhacking.net/forum/index.php?topic=41578.0

Shouldn't need any additional files if you're using Windows.  It uses the .net framework.
