Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!uc!cs.umn.edu!kksys!com50!chris From: chris@com50.c2s.mn.org (Chris Johnson) Newsgroups: comp.periphs.scsi Subject: Re: Wren-V Parity jumper Message-ID: <1990Aug17.165501.14193@com50.c2s.mn.org> Date: 17 Aug 90 16:55:01 GMT References: Distribution: comp Organization: Com Squared Systems, Inc. Lines: 15 In article rdh@sli.com (or uunet!sli!rdh) writes: >As I was replacing one of our Wren-V disks yesterday, going through the >jumpers, I was reminded of a puzzle: What is the purpose of the Parity >Jumper? All of the disks come with the jumper removed, and the manual is >delightfully terse on what it actually does. I assume installing the >jumper enables parity checking? On disk Data? SCSI Data? Time of Day? Jumper installed enables of parity checking of the data bits DB0 - DB7 on the SCSI bus. Wren drives always generate parity on the SCSI bus, but only check it if the jumper is installed. Disk data parity and ECC is always generated and checked, internally. -- ...Chris Johnson chris@c2s.mn.org ..uunet!bungia!com50!chris Com Squared Systems, Inc. St. Paul, MN USA +1 612 452 9522