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From: guyd@austin.ibm.com (Guy Dawson)
Subject: Re: SCSI controller/disk for 386bsd
Originator: guyd@pal400.austin.ibm.com
Sender: news@austin.ibm.com (News id)
Message-ID: <CB6zE6.44Hy@austin.ibm.com>
Date: Tue, 3 Aug 1993 16:34:53 GMT
References: <1993Jul29.122202.23050@nynexst.com> <238u03$6a6@pdq.coe.montana.edu> <22484@durer.cme.nist.gov> <23lo2g$cos@Germany.EU.net>
Organization: IBM Austin
Lines: 30
In article <23lo2g$cos@Germany.EU.net>, bs@Germany.EU.net (Bernard Steiner) writes:
>
> In article <22484@durer.cme.nist.gov>, schnee@sst170.ncsl.nist.gov (Rick Schneeman) writes:
> |> recently ordered several.... How 'bout it, does anyone have performance
> |> or other problems with the C version that we should know about???
>
> The 1542C i got recently has a couple of bits soldered onto the rear side of
> the board. It works quite nicely with the streamer (sorry, I don't have a SCSI
> disk).
This is a fix for the problem early Cs had with sub-standard external cables.
The sub-standard cables are those whose signal impedance is too low. The fix
basically slows down a control signal (ACK?) to allow the external bus to
stabilise before the data is read from the bus...
You need to look for this fix ( two resistors & three wires ) if you want
to use external cable with the minimum of pain and hastle...
[ I have a B and a fixed C... ]
>
> -Bernard
Guy
--
-- -----------------------------------------------------------------------------
Guy Dawson - Hoskyns Group Plc.
guyd@hoskyns.co.uk Tel Hoskyns UK - 71 251 2128
guyd@austin.ibm.com Tel IBM Austin USA - 512 838 2334