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Text File | 1988-11-20 | 1.6 KB | 37 lines | [04] ASCII Text (0x0000) |
- Apple II
- File Type Notes
- _____________________________________________________________________________
- 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.
- _____________________________________________________________________________
-
- 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.
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-