Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!mcvax!kth!sunic!chalmers!afs-news!cert3!tropp
From: tropp@ce.chalmers.se. (Ulf Tropp)
Newsgroups: comp.sys.ibm.pc.rt
Subject: Re: IBM/4.3 4-port async driver
Keywords: 4.3 uucp asynchronous
Message-ID: <512@vice2utc.chalmers.se>
Date: 13 Jun 89 13:04:47 GMT
References: <1259@ibmpa.UUCP>
Sender: news@vice2.utc.chalmers.se
Reply-To: tropp@ce.chalmers.se (Ulf Tropp)
Organization: Chalmers University of Technology, Gothenburg, Sweden.
Lines: 39

In article <1259@ibmpa.UUCP> cslater@ibmpa.UUCP (Charlie Slater) writes:
>
>Status: IBM/4.3 4-port async problem
>
>The driver for the 4-port buffered asynchronous communications card has
>been modified.  With the new driver, uucp is stable at 9.6 Kbps and has
>held the connection for as long as one hour at 19.2 Kbps.

That was posted at the same day I had my modifications working after
over a week of work...
I haven't tested uucp, since I don't want to set that up, but cat-ing
a 50k file to a port and reading it back via a loopback plug seems to work
sometimes at 19200 and almost always at 9600 so I guess uucp would work.
Unbuffered 4-port and Serial/Parallel cards kind of work too.

>All of the kernel changes needed to implement the new driver have been
>isolated to asynchronous communications support, and do not depend on,
>or interfere with, other bug fixes.

My fixes affect caio/asy.c, ca/softint.h and ca/trap.c. caio/psp.c
would be affected too, I just haven't done it yet (we don't use psp's).

>The code is now being beta tested at an IBM Research location.  We
>regret that it has taken so long to overcome the problem, and hope to
>distribute the solution shortly.
>
>charlie slater
>uunet!ibmsupt!cslater
>(415) 855-4413

I guess we should give IBM time to test this out once and for all,
so if any of you out there are in a real hurry, drop me a mail and
I will send you my fixes. We have had two systems running for a couple
of days without problems.

Also, beware of a hardware bug/feature on all cards and possibly
the psp ports too. See another article from me, coming soon.

Ulf Tropp, tropp@ce.chalmers.se