https://temlib.org/AtariForumWiki2018/index.php?action=history&feed=atom&title=DEGAS_file_formatDEGAS file format - Revision history2026-10-18T14:20:13ZRevision history for this page on the wikiMediaWiki 1.30.0https://temlib.org/AtariForumWiki2018/index.php?title=DEGAS_file_format&diff=3044&oldid=prevAtariWikiSysop: 1 revision imported2018-06-03T22:51:48Z<p>1 revision imported</p>
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DEGAS *.PI1 (low resolution)<br />
*.PI2 (medium resolution)<br />
*.PI3 (high resolution)<br />
(PI4, PI5, PI6)<br />
<br />
1 word resolution (0 = low res, 1 = medium res, 2 = high res)<br />
Other bits may be used in the future; use a simple bit<br />
test rather than checking for specific word values.<br />
16 words palette<br />
16000 words picture data (screen memory)<br />
-----------<br />
32034 bytes total<br />
<br />
Conny Pettersson of Unit Seventeen proposed to extend the Degas format with <br />
PI4 and PI5 for TT resolutions in a text file accompaning the viewst program:<br />
<br />
For saving the pictures, I have extended the standard Degas-format PI0 to<br />
the TT-resolutions. Following is a description of the format I use:<br />
ST-Low TT-Low TT-Medium<br />
Extension PI0 PI4 PI5<br />
Resolution 1 word: $0000 1 word: $0007 1 word: $0004<br />
Colormap 16 word 256 word 16 word<br />
Bitmap 32000 bytes 153600 bytes 153600 bytes<br />
Total length 32034 bytes 154114 bytes 153634 bytes<br />
<br />
This format is not in wide spread use as datacompression on those huge screens <br />
really makes sence. Nevertheless various file-extension decriptions on the <br />
internet assign the extensions PI4, PI5 and PI6 to TT Degas resolutions.<br />
</pre><br />
Back to [[ST Picture Formats]]</div>Lp