Re: Self-modifying code

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Article #2535

#2535

From: Art Berggreen
Date: Thu, 12 Oct 1989 04:19

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I seem to recall one of the primary paper tape bootstraps for PDP-11s
used a loop which read a byte from the tape into the instruction loop.
The punch pattern for the leader left the code unchanged until the
beginning of a record at which time the code was modified to jump to
a different part of the bootstrap controlled by the byte read off the
tape.  Details are a bit hazy (twas quite a while ago...).

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References: <522@ryn.esg.dec.com>

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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ginger.acc.com!salt.acc.com!art
From: art@salt.acc.com (Art Berggreen)
Newsgroups: comp.arch
Subject: Re: Self-modifying code
Message-ID: <1989Oct12.041940.5651@ginger.acc.com>
Date: 12 Oct 89 04:19:40 GMT
References: <522@ryn.esg.dec.com>
Sender: news@ginger.acc.com (USENET News System)
Reply-To: art@salt.acc.com (Art Berggreen)
Organization: Advanced Computer Communications, Santa Barbara, California
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