Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!amdahl!pyramid!voder!apple!baum
From: baum@Apple.COM (Allen J. Baum)
Newsgroups: comp.arch
Subject: Re: HP2100 (was: Re: Self Modifying Code)
Message-ID: <14948@apple.Apple.COM>
Date: 29 Jul 88 19:56:12 GMT
References: <33895@yale-celray.yale.UUCP> <6310011@hpcupt1.HP.COM>
Reply-To: baum@apple.UUCP (Allen Baum)
Organization: Apple Computer, Inc.
Lines: 18

[]
>In article <6310011@hpcupt1.HP.COM> hartman@hpcupt1.HP.COM (Doug Hartman) writes:
>
>Re: 2100 architecture.
>...also let you loop forever with the right two JMP instructions.  But 
>since the machine had infinite levels of indirect resolution, you could
>get the same effect by doing a JMP *+1,I
>                               DEF *,I

Actually, the microcoded 2100's had a hack to fault if you went 4 levels deep
into indirection

>Fortunately HP's more recent products
>such as the Precision Architecture (notice I didn't say Spectrum :-)

Sorry, I still call it Spectrum.

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