Article View: comp.sys.dec
Article #4212Re: pdp-11's
From: slsw2
Date: Mon, 24 Jun 1991 15:37
Date: Mon, 24 Jun 1991 15:37
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In article <1991Jun22.041102.1509@spcvxb.spc.edu>, terry@spcvxb.spc.edu (Terry Kennedy, Operations Mgr.) writes: > Recent advances (in geological terms) such as > block mode DMA and the PMI have made the Q-bus almost as fast as, and in > many cases, faster than, the Unibus. I spent a lot of time looking at the QBus and UNIBUS some years ago. With block mode the QBus peaks at about 3 1/3 MB/s. UNIBUS peaks at 6 2/3 MB/s; a memory module can support this throughput using 70 ns static RAM. The main problem with UNIBUS as far as modern systems go is that it has a limited address range; 256KB as opposed to 4MB for the QBus. Roger Ivie slsw2@cc.usu.edu
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!caen!hellgate.utah.edu!cc.usu.edu!slsw2References:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!caen!hellgate.utah.edu!cc.usu.edu!slsw2 From: slsw2@cc.usu.edu Newsgroups: comp.sys.dec Subject: Re: pdp-11's Message-ID: <1991Jun24.093746.48196@cc.usu.edu> Date: 24 Jun 91 09:37:46 MDT References: <ROCKER.91Jun21192228@bucsf.bu.edu> <1991Jun22.041102.1509@spcvxb.spc.edu> Distribution: comp Organization: Utah State University Lines: 14