NGGTool

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"Neo-Geo Graphic Tool Suite" by evo.

Found as an archive including 4 executables and a text file.

Decode.exe and Recode.exe are used for sprite tiles, decode8.exe and recode8.exe for fix tiles.

The decoders take two C ROMs or one S ROM and output a 4BPP SNES planar type file compatible with YY-CHR and Tile molester. Recorders do exactly the opposite.

Warning

It seems recode8.exe is broken, it inverts some color indexes:

Normal  Converted
0	0
1	1
2	2
3	5
4	3
5	7
6	9
7	B
8	4
9	8
A	A
B	C
C	6
D	D
E	E
F	F

This isn't a problem when editing existing ROMs without knowing the palettes, but becomes one when importing converted graphics.