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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
Lines: 6

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...).