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Article #1951Re: MicroVax hardware compatibility
From: Terry Kennedy, Operations Mgr
Date: Fri, 24 Aug 1990 05:20
Date: Fri, 24 Aug 1990 05:20
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In article <12927@hydra.gatech.EDU>, bb16@prism.gatech.EDU (Scott Bostater) writes: > I have some software written for VMS version 4.6 that makes use of a PDP-11 > backward compatibility mode. I want to run the software on a microvax. Is > this backward compatibility mode going to shoot me in the foot? The correct answer is "it depends". If your software did it the documented way and used the RSX AME (Application Migration Executive), it will run on the MicroVAX II *if* the II has the AME installed. On the other hand, if your software does it the way V4's TECO did it (by providing it's own AME and kicking the CPU into compatibility mode) it won't work, as the II doesn't have such a mode. Also, earlier versions of the AME did not supply a software emulator for the CPUs that didn't have compatibility mode. The current version (V2.4) does provide a software emulator. You can expect the software to run slower on the II, since the PDP-11 is being emulated in software. Only the 700-series had hardware compatibility mode. (Yes, I know about the 8600/8650. Those were planned to be called the 790/795, and are really 700-series CPU's). 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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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uunet!samsung!zaphod.mps.ohio-state.edu!mips!dimacs.rutgers.edu!aramis.rutgers.edu!paul.rutgers.edu!njin!spcvxb.spc.edu!terry From: terry@spcvxb.spc.edu (Terry Kennedy, Operations Mgr) Newsgroups: comp.sys.dec Subject: Re: MicroVax hardware compatibility Message-ID: <1990Aug24.012018.485@spcvxb.spc.edu> Date: 24 Aug 90 05:20:18 GMT References: <12927@hydra.gatech.EDU> Organization: St. Peter's College, US Lines: 25