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Article #2886Re: Bootstrapping, was Self-modifying code
From: Ken Yap
Date: Mon, 30 Oct 1989 06:56
Date: Mon, 30 Oct 1989 06:56
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The PDP-11/40 I once used had an interesting primary bootstrap for an AED disk. From the front panel, one toggled in a BR HERE at 0776, then started the CPU. Pressing the IPL button then loaded the bootstrap block in locations 0-0777. When the last instruction was overwritten, the CPU branched into the body of the secondary bootstrap.
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<1989Oct30.065628.12341@cs.rochester.edu>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!wuarchive!udel!rochester!kenReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!wuarchive!udel!rochester!ken From: ken@cs.rochester.edu (Ken Yap) Newsgroups: comp.arch Subject: Re: Bootstrapping, was Self-modifying code Message-ID: <1989Oct30.065628.12341@cs.rochester.edu> Date: 30 Oct 89 06:56:28 GMT References: <35922@apple.Apple.COM> Reply-To: ken@cs.rochester.edu Organization: University of Rochester Computer Science Department Lines: 5 Address: Rochester, NY 14627, (716) 275-1448