Hardware header editor for GB/GBC ROMs?

[regnad]

I've found a couple of GBA header editing tools, but nothing that will work with GB/GBC ROMs.

Does such a tool exist?

 

[FAST6191]

Edit- for some reason I overlooked that you said editor and have just given you a list of viewers. I will leave it but I do not know of any actual editors or even anything to fix it up after you attack it with a hex editor- http://nocash.emubase.de/pandocs.htm (it is down right now as the site has been having serious issues for a few months now and comes and goes) but loads of places will still have them if you search for GBC pandocs and it does appear to be cached. Sadly I do not know of any program that will redo the header hash although it is detailed in the docs although there probably is one and most emulators will probably just flag it and carry on if the hash does not match so it is not a great worry there anyway.

GBX-NDS Header Viewer is probably closest to what you want
http://www.no-intro.org/tools.htm has it.
Sample output

System:             Nintendo Game Boy Color
File:               Pokemon - Crystal Version (UE) (Rev A).gbc
Path:               U:\GB(C)\
Compressed:         No
Length:             2097152 Bytes (16 Mbit)
CRC32:              3358E30A
MD5:                301899B8 087289A6 436B0A24 1FBBB474
SHA1:               F2F52230 B536214E F7C9924F 48339299 3E226CFB
----| Header Data |------------------------------------------------
Entry Point:        0x016EC300
Logo Code:          Ok
Title:              PM_CRYSTAL 
Serial:             BYTE (USA)
GBC Flag:           0xC0 (GBC Only)
New Licensee Code:  01 (Nintendo)
SGB Support:        0x00 (No)
Cartridge Type:     0x10 (ROM + MBC3 + TIMER + RAM + BATTERY)
ROM Size:           0x06 (Ok; 16 Mbit; 2097152 Bytes)
RAM Size:           0x03 (256 Kbit)
Old Licensee Code:  0x33
Version:            0x01 (v1.1)
Header Checksum:    0x26 (Ok)
Global Checksum:    0x18D2 (Ok)
-------------------------------------------------------------------

There is also http://www.romhacking.net/utilities/24/ but it might not be quite as nice to work with.

I know of nothing that rivals the likes of NDSTS/ndshv or GBATA though.

 

[regnad]

I attacked it with a hex editor. So far no problem as long as you attack only in that 15 character space.