Path: utzoo!attcan!uunet!ns-mx!umaxc.weeg.uiowa.edu!williams
From: williams@umaxc.weeg.uiowa.edu (Kent Williams)
Newsgroups: comp.os.minix
Subject: readclock problem, and solution
Keywords: readclock AT
Message-ID: <646@ns-mx.uiowa.edu>
Date: 14 Feb 90 15:03:42 GMT
Sender: news@ns-mx.uiowa.edu
Reply-To: williams@umaxc.weeg.uiowa.edu (Kent Williams)
Followup-To: /dev/null
Organization: U of Iowa, Iowa City, IA
Lines: 23

PROBLEM: readclock wouldn't
SYMPTOM: readclock always printed '-q'

I tore my hair out for a while, thinking that /dev/port was broken. Then I
looked at readclock.c, and found out the REAL problem was that my AT clone
didn't have the proper signature in the ROM.

Solution:

Comment out the test at the beginning of main for whether or not readclock
is running on an AT.

Discussion:

I think that portio.c is a little hokey, and would be dreadful if you ever
had to do REAL I/O.  Why not have a library function that asks for the
I/O Priveledge bit to be set in the task state segment, and then do real I/O?


--
                               
Kent Williams                  "What's an Address Bus?  How do Icons work?" 
williams@umaxc.weeg.uiowa.edu  -- Advertisement for Time-Life Books