Article View: comp.sys.dec
Article #3584Re: Can one put standard Q-Bus memory in the PMI bus of an 11/84?
From: Terry Kennedy, Operations Mgr.
Date: Sun, 28 Apr 1991 20:49
Date: Sun, 28 Apr 1991 20:49
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In article <73510@eerie.acsu.Buffalo.EDU>, kalisiak@acsu.buffalo.edu (christophe m kalisiak) writes: > The 11/84 has a Q-Bus CPU, which is the same as the 11/83. Therefore, > one should be able to put Q-Bus memories in it, albiet with some reduction > in speed. The dedicated memory slots in the 84 should be identical to the CD slots in a BA23/BA123, but may very well be dedicated to PMI memory. While the CPU certainly generates all the Q-bus signals, they may not all be wired to the memory slots. Further (as I mentioned earlier) the bus converter card certainly doesn't know what to do with non-PMI memory - when you try to DMA into non-PMI mem- ory it will generate a PMI cycle which your boards will miss. I still think you ought to grab an old 84-only MSV11-J board. They can be had for a few hundred dollars and it's an easier, supported, solution. Terry Kennedy Operations Manager, Academic Computing terry@spcvxa.bitnet St. Peter's College, US terry@spcvxa.spc.edu (201) 915-9381
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!stanford.edu!rutgers!njin!spcvxb.spc.edu!terryReferences:
<72943@eerie.acsu.Buffalo.EDU> <1991Apr26.191350.47574@cc.usu.edu> <73510@eerie.acsu.Buffalo.EDU>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!stanford.edu!rutgers!njin!spcvxb.spc.edu!terry From: terry@spcvxb.spc.edu (Terry Kennedy, Operations Mgr.) Newsgroups: comp.sys.dec Subject: Re: Can one put standard Q-Bus memory in the PMI bus of an 11/84? Message-ID: <1991Apr28.204934.1292@spcvxb.spc.edu> Date: 28 Apr 91 20:49:34 GMT References: <72943@eerie.acsu.Buffalo.EDU> <1991Apr26.191350.47574@cc.usu.edu> <73510@eerie.acsu.Buffalo.EDU> Organization: St. Peter's College, US Lines: 20