Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!unmvax!pprg.unm.edu!hc!ames!amdcad!sun!pitstop!sundc!seismo!uunet!mcvax!hp4nl!botter!star.cs.vu.nl!ast
From: ast@cs.vu.nl (Andy Tanenbaum)
Newsgroups: comp.os.minix
Subject: Re: Help:  minix on vax
Keywords: pc_simulator, minix on vax
Message-ID: <2008@ast.cs.vu.nl>
Date: 3 Feb 89 16:21:04 GMT
References: <1338@unccvax.UUCP> <18287@adm.BRL.MIL>
Reply-To: ast@cs.vu.nl (Andy Tanenbaum)
Organization: VU Informatica, Amsterdam
Lines: 17

>In article <1338@unccvax.UUCP> billchu@unccvax.UUCP (Tseng Bill Chu) writes:
>- Is there someone on the net using minix on vax as a teaching tool?

I must admit, I haven't used the simulator since 1.0, so I am not entirely
surprised that there are problems now.  My intuition says that the 8088
interpreter is pretty solid, but that all the new I/O stuff added since
1.0 (hard disk, AT ram disk, EGA, etc) is the source of the trouble.

Fortunately, the simulator is 100% in C, and has lots of debugging
capabilities.  Start a run up and print out, for example, every control
transfer instruction (jump, call, trap, etc) to see what it is doing and
how it got there.  I would also put a print statement in the 8088
interpreter code for the IN and OUT instructions, to see what is going on.

Andy Tanenbaum (ast@cs.vu.nl)

P.S. If you finally get it debugged, I am interested in the bug fixes too.