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From: rjn@hpfcso.HP.COM (Bob Niland)
Newsgroups: comp.sys.hp
Subject: Re: hpib/scsi ?
Message-ID: <7370272@hpfcso.HP.COM>
Date: 22 Dec 90 18:00:17 GMT
References: <1990Dec21.181837.6797@eye.com>
Organization: Hewlett-Packard/FSY Ft.Collins,CO,USA
Lines: 39

re: >I'm upgrading hardware for a group of software developers.

>   *Any problems running both hpib and scsi disks on 1 375?

No, in fact, I'm doing it.  Just avoid the [very] old 98625A HP-IB card.
Use a 98625B or 98262A (330/350/360/370 only).

>   *Does hp make a scsi disk interface that plugs into a DIO2 slot? 

No.  But you can usually convert at least one DIO-II slot to DIO-I via
a 98242A/B kit or by getting an expander with a slot already present.

>    can I hang disks off the interface I use for my o/m drives (98658a)?

Yes.

>    Is either significantly faster or slower than the built-in scsi
>    interface on the 375?

Not with current disk drives.

>   *Does hp make a DIO or DIO2 hpib interface card that can handle more
>    than 4 disks (like the 98625b)?  The real question here is whether or
>    not I can put 4 7963's (12 mechanisms) on a single 375.

The AMIGO protocol under the CS/80 command set limits disks to addresses
0..7 (one PPOLL response line per HP-IB "DIO" data line).  Each mech in a
7963 uses one bus address.  You can only put 3 7963s with 8 total mechs on a
single HP-IB.  You can have multiple HP-IBs and SCSIs, subject to
considerations about contention for the two DMA channels.

If you haven't bought the disks yet, get the C2213A instead.  It has much
more attractive econmics, doubles the max size of each mech and offers
optional built-in DAT, CD and MO.

Regards,                                              Hewlett-Packard
Bob Niland                                            3404 East Harmony Road
Internet: rjn@hpfcrjn.FC.HP.COM                       Fort Collins
UUCP: [hplabs|hpu*!hpfcse]!hpfcrjn!rjn                CO          80525-9599