Difference between revisions of "DUO file format"

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<pre>
 
<pre>
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DUO file format   *.DU1 *.DUO (low resolution)
+
DUO    *.DU1 *.DUO (low resolution)
−
                  *.DU2      (medium resolution)
+
      *.DU2      (medium resolution)
  
 
Created by Anders Eriksson: http://ae.dhs.nu/
 
Created by Anders Eriksson: http://ae.dhs.nu/

Latest revision as of 00:51, 4 June 2018

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.

Back to ST Picture Formats