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From: sjhg9320@uxa.cso.uiuc.edu (Maximum Slackness )
Newsgroups: comp.sys.mac.misc
Subject: Re: 68000 specific program?
Message-ID: <1991May18.190505.21579@ux1.cso.uiuc.edu>
Date: 18 May 91 19:05:05 GMT
References: <1991May18.180250.20204@cunixf.cc.columbia.edu>
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Organization: University of Illinois at Urbana
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rs54@cunixf.cc.columbia.edu (Richard Sucgang) writes:

>I am unsure about this but:
>Is it possible to write a program so coded that it
>will specifically run only with a 68000 chip, and not t
>on any of the later generation chips?

The instruction sets for the MC68XXX series are pretty much entirely
forward compatible, but you can always tell which chip you're using
by checking the Status Registers or, if you're running under the Mac OS,
by making a quick call to SysEnvirons (Pre-System 7) or Gestalt. 
Once you've checked which chips are there, just exit to shell if you've
returned a result you don't want.

Any chance you're doing this to support an emulator? 
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