Article View: comp.sys.nsc.32k
Article #553Re: Problems working with SCSI
From: Craig Ruff
Date: Mon, 10 Dec 1990 19:11
Date: Mon, 10 Dec 1990 19:11
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In article <10427@ucrmath.ucr.edu> rhyde@ucrmath.ucr.edu (randy hyde) writes: >The only problem I have with working with SCSI is >that you've got to design a whole 'nother computer >system to do the interface. Considerably more work >than adding a latch to obtain a parallel port. Well, maybe not. I read an article in Circuit Cellar, Ink (I think) recently that showed how one might get away with less. Basically, you fake enough of the interface so that all real SCSI devices know the bus is busy and stay off while you access your pseudo-SCSI device. Then, you could use the SCSI bus however you liked (within some restrictions). As long as BSY is asserted, you can use the other control lines to do things like register select, read/write, etc. I can check for the exact article and issue if anyone is interested in the details. -- Craig Ruff NCAR cruff@ncar.ucar.edu (303) 497-1211 P.O. Box 3000 Boulder, CO 80307
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!zaphod.mps.ohio-state.edu!ncar!cruff From: cruff@ncar.ucar.edu (Craig Ruff) Newsgroups: comp.sys.nsc.32k Subject: Re: Problems working with SCSI Message-ID: <9472@ncar.ucar.edu> Date: 10 Dec 90 19:11:11 GMT References: <9012100048.24380@otto.bf.rmit.oz.au> <10427@ucrmath.ucr.edu> Reply-To: cruff@handies.UCAR.EDU (Craig Ruff) Organization: Scientific Computing Division/NCAR, Boulder CO Lines: 19