Path: utzoo!utgpu!watserv1!watmath!uunet!wuarchive!mailrus!tut.cis.ohio-state.edu!uccba!uceng!kamat
From: kamat@uceng.UC.EDU (Govind N. Kamat)
Newsgroups: unix-pc.general
Subject: Accessing ports on ATT PC6300 PLUS
Summary: How does one perform IN and OUT using UNIX?
Message-ID: <KAMAT.89Dec8093809@uceng.UC.EDU>
Date: 8 Dec 89 14:38:09 GMT
Sender: kamat@uceng.UC.EDU
Organization: College of Engg., University of Cincinnati
Lines: 21

Distribution: unix-pc

I need to read from/write to the I/O ports on an AT&T PC6300 PLUS.
This 80286 machine runs UNIX and has a DOS compatiblity mode in which
it can run DOS software.  Now, in the DOS mode, using the Microsoft C
compiler, I can use the functions inp() and outp() to perform the
assembler IN and OUT instructions.  It isn't clear whether the UNIX
end has similar functions available.

I thought maybe ioctl(2) might help, but that manual page just refers
me to section 7 which doesn't seem to exist in my copy of the
documentation.  If someone out in Netland has any information on
ioctl() devices, or even better, knows how to do port I/O, I would be
most grateful if you could e-mail.

Also, I'm not sure whether this is the correct group for postings
related to the PC6300.  If not, please accept my apologies.

--
Govind Kamat
University of Cincinnati, Engineering