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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!elroy.jpl.nasa.gov!swrinde!cs.utexas.edu!geraldo.cc.utexas.edu!portal.austin.ibm.com!awdprime.austin.ibm.com!guyd 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