== Thomson MO/TO files formats

GrafX2 is able to load/save pictures for the Thomson MO/TO ranges of computer in several formats :
* RAW binary files. Two files of 8000 (8008 or 8032 with color palette) per picture : One 'P' file for the "FORME" VRAM, one 'C' file for the color VRAM (READ ONLY)
* Autoloading DECB binary files.
* MAP files (with optional TO-SNAP extension)

As the TO7, TO7/70 and MO5 machines only have a fixed palette, palette data (or TO-SNAP) extension is not saved when targetting theses machines.

== MAP files

documentation for the MAP files : http://collection.thomson.free.fr/code/articles/prehisto_bulletin/page.php?XI=0&XJ=13

MAP files are saved on a Thomson machine using GET/SAVEP and loaded using LOADP/PUT. See link below for loading the palette from the TO-SNAP extension.
GrafX2 use an optimized packing algorithm.

== GrafX2 autoloading DECB binary files (BIN)
GrafX2 use a format that can be natively be loaded on the Thomson machine using the LOADM instruction.

The FORME VRAM is selected and loaded, then the COULEUR VRAM is selected and filled.

{{{
offset| data                    | comment
 0000 | 00 00 01 e7 c3 65       | write 0x65 to 0xe7c3 to select FORME
 0006 | 00 1f 80 40 00 xx xx xx | write 8064 bytes to 0x4000 (VRAM)
 1f8c | 00 00 01 e7 c3 64       | write 0x64 to 0xe7c3 to select COULEUR
 1f91 | 00 1f 80 40 00 xx xx xx | write 8064 bytes to 0x4000 (VRAM)
 3f16 | ff 00 00 00 00          | end marker
}}}

Here is a BASIC 128/512 program to load such a file :
{{{
10 REM CHARGEMENT D'UNE IMAGE GrafX2
20 REM (C) THOMAS BERNARD
30 LOCATE,,0 'DESACTIVE CURSEUR
40 LOADM"POISCTO8"
50 REM PALETTE EN VRAM APRES L'IMAGE
60 FOR I=0 TO 15
70 BGR=PEEK(&H4000+8000+I*2)*256+PEEK(&H4000+8000+I*2+1)
80 PALETTE I,BGR
90 NEXT I
100 IF INKEY$="" GOTO 100
110 LOCATE,,1 'ACTIVE CURSEUR
120 REM AFFICHAGE DU COMMENTAIRE
130 FOR I=0 TO 31
140 C=PEEK(&H4000+8032+I)
150 IF C>=32 AND C<127 THEN PRINT CHR$(C);
160 NEXT I
170 PRINT
}}}