Article View: comp.arch
Article #20216Re: Was *this* the first RISC chip?
From: Craig Ruff
Date: Tue, 07 Mar 1989 15:58
Date: Tue, 07 Mar 1989 15:58
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1761 bytes
In article <1068@cantuar.UUCP> greg@cantuar.UUCP (G. Ewing) writes: >During a recent fit of idle curiosity, I came across some articles >describing the microprocessor used in many of HP's handheld >calculators from the HP-35 on. >... Ideally I'd like enough info to write a >simulator for it (okay, so I'm wierd). The articles I have (from >the HP Journal) don't go into much detail. Ah yes. When I was a college student with nothing better to do, I wrote just such a simulator for the HP-41C. I got the description of the processor and the ROM listings from the newsletter of that calculator club (I forget the name exactly) that dug into the guts of programmable calculators to see what was there. Anyway, I programmed it on an HP 9825 desktop (one line display!) we had in the chem lab. I had to type in all of the instructions in hex by hand (a few K!). I got it to the point where it would actually do stuff like the calculator would. Too bad I didn't make copies of the articles and the code and data files. I could have put it on much more powerful computers! :-) -- Craig Ruff NCAR INTERNET: cruff@ncar.UCAR.EDU (303) 497-1211 P.O. Box 3000 CSNET: cruff@ncar.CSNET Boulder, CO 80307 UUCP: cruff@ncar.UUCP
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!cruff From: cruff@ncar.ucar.edu (Craig Ruff) Newsgroups: comp.arch,comp.sys.hp Subject: Re: Was *this* the first RISC chip? Keywords: Hewlett-Packard, microprocessor, RISC Message-ID: <1532@ncar.ucar.edu> Date: 7 Mar 89 15:58:28 GMT References: <1068@cantuar.UUCP> Reply-To: cruff@handies.UCAR.EDU (Craig Ruff) Organization: Scientific Computing Division/NCAR, Boulder CO Lines: 24