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From: han@apple.UUCP (Byron Han)
Newsgroups: comp.sys.mac
Subject: Re: An A/UX question...
Message-ID: <6674@apple.UUCP>
Date: Mon, 9-Nov-87 01:26:32 EST
Article-I.D.: apple.6674
Posted: Mon Nov  9 01:26:32 1987
Date-Received: Wed, 11-Nov-87 04:30:36 EST
References: <1039@phoenix.Princeton.EDU> <6622@apple.UUCP> <6635@apple.UUCP> <3117@husc6.UUCP>
Reply-To: han@apple.UUCP (Byron Han)
Organization: Apple Computer Inc., Cupertino, USA
Lines: 35

In article <3117@husc6.UUCP> stew@endor.UUCP (Stew Rubenstein) writes:
>In article <6635@apple.UUCP> rpd@apple.UUCP (Rick Daley) writes:
>>There is an A/UX manual called "The A/UX Toolbox Guide" that goes into detail
>> about what applications do that keep them from working under A/UX.
>
>How can a certified developer get a copy of that manual so that I
>can write my applications in such a way that they WILL run under A/UX?
>
Well, some pointers on how to be good.

* Do not assume 24 bit addressing.  Do not stuff anything into the topmost 
byte of a handle

* Do not used 68000 priviledge instructions.  A/UX Toolbox applications 
run in user mode,

* Do not directly address hardware.

* Do not use low memory globals if at all possible.

Of course, many of these "restrictions" are actually good Macintosh programming 
practices.  In general, do not make a lot of assumptions about the current 
Macintosh programming model as it is subject to change, e.g. A/UX toolbox
access is a modification on the Macintosh programming model.  Applications that
make assumptions about the programming model (i.e. a lot of them) will break.


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