Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!apple!motcsd!xdos!doug
From: doug@xdos.UUCP (Doug Merritt)
Newsgroups: comp.sys.amiga
Subject: Re: Need help with supra interface!!
Message-ID: <628@xdos.UUCP>
Date: 22 Jan 90 14:38:58 GMT
References: <824@darkstar.ucsc.edu>
Reply-To: doug@xdos.UUCP (Doug Merritt)
Organization: Hunter Systems, Mountain View CA (Silicon Valley)
Lines: 26

In article <824@darkstar.ucsc.edu> rabbits@ucscb.UCSC.EDU () writes:
>after supraformat loads it immediately trys to talk to the
>drive and sets the drive and controller to "other"
>and sets the lowest cylinder to 0 and the high to 1.
>the drive light goes on and the format util seems to be locked up
>it wont let me exit or do anything but the mouse still works.
>
>The drive is a CDC 94161-86
>i dont have the specs for it but was wanting to
>play with low numbers for formating specs.

The jumpers on the drive are probably set wrong. I had similar problems
until I changed the jumpers. Mine had originally been jumpered to not
spin up the drive until told to, which is not what supra expects. It
had also been jumpered to the wrong unit number.

Lastly, you probably need to add termination resisters to the drive.
Drives intended for e.g. Mac's are usually already terminated because
generally people only use one. CDC drives are usually not terminated
internally because they're often used in e.g. workstations with multiple
drives, and a single terminator is added *externally*. The internal
termination resister packs are dirt cheap and readily available.
	Doug
-- 
Doug Merritt		{pyramid,apple}!xdos!doug
Member, Crusaders for a Better Tomorrow		Professional Wildeyed Visionary