The most important of the A/UX programmer's manuals is probably the A/UX
Toolbox Macintosh ROM Interface, which details the Macintosh Toolbox calls
that are available under A/UX.
Using this information, you need to decide what type of application
you want. It is possible to write your application under the
Macintosh OS in any of the development systems available to you there, as
long as you take into account which Toolbox calls are available to you
under A/UX. This would give you the added benefit of having your
application run under both A/UX and the Macintosh OS.
The A/UX Developers Tools from APDA gives you the benefit of programming
under A/UX, and this package includes a number of very useful tools
designed specifically for A/UX development. This package is centered
around an A/UX-compatible version of the Macintosh Programmer's Workshop,
so if you are familiar with that package, you will be right at home. Note
that applications written in this environment will not be able to run under
the native Macintosh OS.