Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!swrinde!elroy.jpl.nasa.gov!jarthur!nntp-server.caltech.edu!toddpw From: toddpw@nntp-server.caltech.edu (Todd P. Whitesel) Newsgroups: comp.sys.apple2 Subject: Re: Sharing a SCSI HD Message-ID: <1991May8.000012.6684@nntp-server.caltech.edu> Date: 8 May 91 00:00:12 GMT References: <1991May4.064334.3019@nntp-server.caltech.edu> Organization: California Institute of Technology, Pasadena Lines: 20 gtolar@xcluud.sccsi.com (Glynne Tolar) writes: >I've connected two DMA SCSI cards to one Seagate ST-296N. > They wasted no time in locking up. First, the Seagate had better not have been terminated. Second, the DMA SCSIs must be the ends of the chain (that's probably what you did, hooking both into the two 50-pin connectors on the back of the HD case). > By the way the same results occoured with a DMA and a Rev.C SCSI card. The Rev.C ROMs don't arbitrate so that makes sense. There is one other possibility: the DMA SCSI has terminating resistors built into it, but it does not supply power to them (what, and toast Apple's wimpy power supply?). The drive has to do it and I do not know for sure if Seagates supply terminator power or not. (I know my Quantum does.) Todd Whitesel toddpw @ tybalt.caltech.edu