DUO

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{{FormatInfo
 
{{FormatInfo
|name=DU*
 
 
|formattype=electronic
 
|formattype=electronic
 
|subcat=Graphics
 
|subcat=Graphics
 
|extensions={{ext|du1}} {{ext|du2}} {{ext|duo}}
 
|extensions={{ext|du1}} {{ext|du2}} {{ext|duo}}
 
}}
 
}}
'''DU*''' is a set of similar graphics formats for the Atari computers with unknown origin.
+
"'''DUO'''" is a set of similar graphics formats for the Atari computers with unknown origin. The original name, if anything, is unknown.
  
 
== Identification ==
 
== Identification ==
 
Files are exactly 113600 bytes long.
 
Files are exactly 113600 bytes long.
  
 +
From [https://web.archive.org/web/20191221202304/http://www.atari-wiki.com/index.php/DUO_file_format the AtariForumWiki page]:
 
<pre>
 
<pre>
 
DUO    *.DU1 *.DUO (low resolution)
 
DUO    *.DU1 *.DUO (low resolution)
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== Software ==
 
== Software ==
 
* [[RECOIL]]
 
* [[RECOIL]]
 +
* [http://snisurset.net/code/abydos/ abydos]
  
 
== Sample files ==
 
== Sample files ==
* https://telparia.com/fileFormatSamples/image/duStar/
+
* {{DexvertSamples|image/duStar}}
  
 
== Links ==
 
== Links ==
 
* https://web.archive.org/web/20191221202304/http://www.atari-wiki.com/index.php/DUO_file_format
 
* https://web.archive.org/web/20191221202304/http://www.atari-wiki.com/index.php/DUO_file_format

Latest revision as of 05:15, 28 December 2023

File Format
Name DUO
Ontology
Extension(s) .du1 .du2 .duo

"DUO" is a set of similar graphics formats for the Atari computers with unknown origin. The original name, if anything, is unknown.

Contents

[edit] Identification

Files are exactly 113600 bytes long.

From the AtariForumWiki page:

DUO    *.DU1 *.DUO (low resolution)
       *.DU2       (medium resolution)

Created by Anders Eriksson: http://ae.dhs.nu/
These are essentially 2 screens with over-scan interlaced together.

Low resolution files are 416x273 pixels:

16 words       palette
56784 bytes    screen 1
56784 bytes    screen 2
-----------
113600 bytes   total

Medium resolution files are 832x273 pixels:

4 words        palette
56784 bytes    screen 1
56784 bytes    screen 2
24 bytes       padding if present, otherwise total size is 113576 bytes
-----------
113600 bytes   total

Both screens use the same palette, but when viewed the human eye merges the two 
alternating images into one.

[edit] Software

[edit] Sample files

[edit] Links

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