Apple II
File Type Notes
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                                                  Developer Technical Support


File Type:         $08
Auxiliary Type:    $4000

Full Name:     Packed Apple II Hi-Res Graphics File
Short Name:    Packed Hi-Res File

Written by:    Matt Deatherage                                  November 1988

Files of this type and auxiliary type contain a packed Apple II Hi-Res 
graphics screen.
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Files of type $08 and auxiliary type $4000 contain a packed Apple II Hi-Res 
graphics screen which has been packed with the same algorithm that PackBytes 
on the Apple IIGS uses.  This algorithm takes the 8K graphics screen and 
produces a file with an indeterminate length and internal format, so no "mode 
byte" at offset +121 is supported as it is with other files of type $08.

You can display a file of this type and auxiliary type by loading it, using 
UnPackBytes to decrypt the data, moving it into a high-resolution display 
buffer ($2000 or $4000 in the standard Apple II memory map), then simply 
toggling the appropriate display soft switches.

File type $08 was originally defined as an Apple /// FotoFile, but now it is 
useful for those applications that wish to save high-resolution or double 
high-resolution data with a file type other than $06, which is a standard 
binary file.  If you choose to use this type, you should remember that older 
applications which do not check the auxiliary type may attempt to interpret 
these files incorrectly.

