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Apple II
File Type Notes
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Developer Technical Support
File Type: $B9 (185)
Auxiliary Type: All
Full Name: Apple IIgs Classic Desk Accessory
Short Name: Classic Desk Accessory
Written by: Dave "Mr. Nifty" Lyons September 1990
Files of this type contain Apple IIgs Classic Desk Accessories in OMF format.
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Classic Desk Accessories are available by pressing Command-Ctrl-Esc, whether
or not a desktop application is running.
Files of type $B9 in the System:Desk.Accs directory of the boot volume are
automatically loaded with the Loader and installed into the system with
InstallCDA at boot time. Bit 15 of the auxiliary type is the "inactive" bit--
if it's set, GS/OS does not load the CDA. All other bits in the auxiliary
type are reserved and should be zero.
CDAs are stored on disk in Object Module Format, which is defined in Appendix
F of GS/OS Reference. Once the Loader brings your CDA's code into memory, the
format is as specified in the Desk Manager chapter of Apple IIgs Toolbox
Reference, volume 1.
CDA authors should be sure to read the material listed under "Further
Reference."
Further Reference
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o Apple IIgs Toolbox Reference, Volumes 1 and 3
o GS/OS Reference
o Apple IIgs Technical Note #71, Desk Accessory Tips and Techniques
Also see infor from these URL's;
http://www.lib.ox.ac.uk/internet/news/faq/archive/graphics.fileformats-faq.part2.html
Also Note:
Apple II
File Type Notes
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Developer Technical Support
File Type: $BC (188)
Auxiliary Types: All
Full Name: Apple IIgs Generic Load File
Short Name: Load file (generic)
Written by: Matt Deatherage July 1990
Files of this type and auxiliary type contain OMF for the Apple IIgs.
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Files of type $BC contain data that is to be loaded by one of the Apple IIgs
Loaders (either the System Loader or ExpressLoad). No other information about
the data is known. Load files which do not fit other load file type
definitions ($B3-$BD) should be of type $BC. The most common use for files of
type $BC are code modules.
The following auxiliary type assignment is current for this file type as of
the publication date of this Note:
Auxiliary Type Short Name Developer
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$0000 Load file (generic) any
$4001 Nifty List Module DAL Systems
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Table 1-Auxiliary Type Assignments
Note that auxiliary type $0000 is listed as "any" developer. You may create
and use files of $BC and auxiliary type $0000 as you wish; Apple does not
maintain a specific assignment for this auxiliary type. However, if you use
auxiliary type $0000, you must not identify your files exclusively by it.
Many load files can share this auxiliary type, and it alone is not suitable
for file content identification. Apple allows the free use of auxiliary type
$0000 since load files must have a load file type and often further
identification is not necessary.
Also note that auxiliary type $0000 is reserved in other file types; you may
not use auxiliary type $0000 in other file types without assignment from
Developer Technical Support.
Further Reference
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o GS/OS Reference