From: bchase@bigwpi.WPI.EDU (Bret Chase) Subject: Re: PDS vs. Nubus (was Re: LC III NuBus Capable?) Organization: Worcester Polytechnic Institute Lines: 44 NNTP-Posting-Host: bigwpi.wpi.edu In article wis@liverpool.ac.uk (Mr. W.I. Sellers) writes: >Bill Higgins-- Beam Jockey (higgins@fnalf.fnal.gov) wrote: >: In article , hades@coos.dartmouth.edu (Brian V. Hughes) writes: >: > mmiller@garnet.msen.com (Marvin Miller) writes: >: >>My friend recently purchased a LC III and he wants to know if there is >: >>such a demon called NuBus adapter for his PDS slot? > >: > The LC family of Macs can only >: > use PDS cards. They are not able to use NuBus. > >: Ah, but why? Can some technically-hip Macslinger tell us what the >: difference is between PDS and Nubus? > >: Is it impossible to make a gadget that plugs into PDS and ends in a >: Nubus card cage? At least, Marvin's friend has not been able to >: locate one and neither have I. What is the fundamental reason for >: this? > >I think that there do exist NuBus expansion cages (I'm sure I've seen >them advertised occassionally), but I think that the main problem is that >they cost much more than the difference in price between say a LC and IIvx >so unless you need lots of NuBus slots its not worth the bother. > >(Of course, it may be that these extra boxes are so expensive because >no one buys them because they are so expensive...) > >NuBus technology isn't a special Apple Proprietry thing (I have this >sneaky feeling that it is licensed from Texas Instruments???) so there >is no problem building an expansion box. Apple uses the IEEE Nubus-90 standard for their 32 bit backplane bus. (I got this from a technote that I reada couple of weeks ago) >>>>>>>>>>other stuff deleted<<<<<<<<< Hope this helps, Bret Chase -- internet:bchase@wpi.wpi.edu Macintosh! bellnet: (508) 791-3725 Smile! It won't kill you! snailnet: wpi box 3129 :) :) :) :) :) :) :) :) 100 institute rd. Worcester, MA 01609-2280