Path: utzoo!attcan!uunet!mcvax!hp4nl!botter!star.cs.vu.nl!ast
From: ast@cs.vu.nl (Andy Tanenbaum)
Newsgroups: comp.os.minix
Subject: Re: MINIX on PS/2 Model 25 !
Message-ID: <1876@ast.cs.vu.nl>
Date: 9 Jan 89 11:22:15 GMT
References: <5687@boulder.Colorado.EDU>
Reply-To: ast@cs.vu.nl (Andy Tanenbaum)
Organization: VU Informatica, Amsterdam
Lines: 19

In article <5687@boulder.Colorado.EDU> saliba@tramp.Colorado.EDU writes:
>   I have been trying to get MINIX 1.2 to run on a PS/2 Model 25
>   with a 720KB 3.5" Diskette drive.  I seem to be getting the     
>   same problems people are have on the Model 50.

No.  You are actually having different problems.  The simplest solution is
to try V1.3.  This has been thoroughly tested on a Model 30 and works fine.
It is hard to imagine that it won't work on a Model 25.  There are a few
important differences between 1.2 and 1.3 that have been put in especially
for the PS/2 model 30, such as fussing with the planar control register.

The current suspicion about the Model 50 is the level-triggered interrupts.
When an interrupt comes in and is handled, the code normally does an IRET
instruction, and with level triggered interrupts the same interrupt may
happen again, endlessly, until something is done about it.  I think this
problem has to do with the Microchannel, and shouldn't be present on the
Model 25.  Still, anyone who has suggestions, please post them here.

Andy Tanenbaum (ast@cs.vu.nl)