Path: utzoo!mnetor!uunet!husc6!hao!ames!pasteur!ucbvax!HGRRUG51.BITNET!ZWARTS
From: ZWARTS@HGRRUG51.BITNET
Newsgroups: comp.os.vms
Subject: Re: KA820 ports 1-3
Message-ID: <8803211647.AA02436@ucbvax.Berkeley.EDU>
Date: 18 Mar 88 08:34:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 28

>    We have a VAX 8250 and on the back of the cabinet is a plate which says
>    "KA820".  It has four ports, numbered 0-4, and 0 is used as the console
>    port.

>    Problem:  Ports #1-3 do not show up in the configuration after the system
>    is booted.  They say they are async comm ports.

>    Question: Is this normal?  Can I somehow configure and use these ports?

This is normal. In order to configure these ports issue the following commands:
        $ RUN SYS$SYSTEM:SYSGEN
        connect slu=1
        connect slu=2
        connect slu=3
After this you have the ports TCA0:, TCB0: and TCC0:. These ports have a
maximum speed of 1200 baud and are very expensive in use (one interrupt per
character I/O).

>    Secondary question:  Is the KA820 what makes an 8200 an 8250?

I thought that the KA820 is the 8200 processor. We have a Vax 8300, which has
two KA820 processors.

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