From edith!cmcl2!rutgers!ucsd!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!uakari.primate.wisc.edu!aplcen!uunet!bywater!acheron!archet!larouch!news Fri Nov 17 15:11:31 EST 1989
Article 15 of comp.sys.ibm.pc.rt:
Path: edith!cmcl2!rutgers!ucsd!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!uakari.primate.wisc.edu!aplcen!uunet!bywater!acheron!archet!larouch!news
>From: jparnas@larouch.UUCP (Jacob Parnas)
Newsgroups: comp.sys.ibm.pc.rt
Subject: Re: Simple and Cheap Solution to RT serial problems
Keywords: serial fix
Message-ID: <1989Nov16.091724.8595@larouch.uucp>
Date: 16 Nov 89 09:17:24 GMT
References: <210@med.Stanford.EDU>
Sender: news@larouch.uucp (Usenet News Program)
Reply-To: jparnas@larouch.UUCP (Jacob Parnas)
Organization: Larouch Headquarters
Lines: 40

In article <210@med.Stanford.EDU>, johnw@med.Stanford.EDU (John
Wiederhold) writes:
> After getting fed up with "device /dev/ttys0 overflow" errors while
> I was running at 9600 baud, I realized that there is a reasonably
> simple and inexpensive way to fix this.  I got standard IBM serial
> card meant for your basic IBM-PC/XT, and replaced the UART chip on
> it.  Once installed in the RT, it shows up as ttyc0.  The card costs
> about $25-30 and the chip costs about $15.  Now my RT runs at 19200
> baud without one complaint.
> 
> Good luck.  Feel free to send any questions or comments to me.
> 
> John Wiederhold
> Stanford Medical School Information Systems Group

There are two other solutions to serial port problems on 4.3 BSD/RT/AOS.

1.  Get the IBM "Buffered" 4 port adapter.  With the excellent driver that
    Charlie Slater wrote (at IBM PaloAlto), one can run SLIP and UUCP at 19200
    with no problems.  One needs the "Buffered" 4 port card and the new driver.
    The 4 port card is not useable unless one uses both the "Buffered" card
    and the 4 port fix to the December 4.3/AOS release.

2.  Dickens Data Systems did a port of their 8 port card to 4.3/AOS.  It
    can support multiple ports with input of 38400 baud.  The cost is around
    $1600 per 8 port card.

I use the Dickens card in my home RT and get a full newsfeed with a Telebit
T2500 at 19200 baud and use slip at 38400 baud with the Microcom QX/V.32c
modem, often at the same time.  There don't seem to be any problems.

Hope this information is useful to somebody.

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