Re: Apple Commander SYS files

On Aug 13, 3:09 am, "John B. Matthews" <nos...@xxxxxxxxxxxxxx> wrote:
That's what I wondered: Does anything break if the aux-type of a SYS
file isn't $2000? There's no way to prove the negative, but I'd be
interested to hear of exceptions.
-----
ProDOS 8 Technical Reference Manual

5.3.3 System Program Defaults

Each file entry in a directory has a two byte aux_type field. This
field contains information such as load address for BASIC programs or
binary files, and record length for text files, for system files it is
unused. If your system program has a small amount of default
information you would like to preserve from one execution of the
program to the next, this field is a good place to store it.
-----
AppleShare Programmer's Guide for the Apple II

Appendix B

Multi-launch applications

The first thing to remember about multi-launch applications is that
one copy of the application will be shared by several computers. The
system loader will take care of opening and loading the file in a safe
manner such that several computers can load the application at the
same time. As the programmer, you must remember that you should not
write to the application files (to save configuration information, for
example) just like you shouldn't write in books borrowed from a
library - other people have to use it, too.
-----
So, if you are only using local disks, nothing will break but if you
have a networked system, don't modify the application (which to my way
of thinking includes the aux_type).
.

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