DUO

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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

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.

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Sample files

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