DUO file format

DUO file format    *.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.

Back to ST Picture Formats