Article View: comp.arch
Article #1697Re: Registers in memory
From: John G Dobnick
Date: Sat, 29 Jul 1989 06:13
Date: Sat, 29 Jul 1989 06:13
21 lines
1363 bytes
1363 bytes
From article <8907281547.AA28878@maxwell.ece.cmu.edu>, by mbjr@maxwell.ece.cmu.edu (Mauricio Breternitz): > The (now ancient) IBM 1130 also had the three index registers > at memory locations 1, 2, 3 The (even more ancient) IBM 1620 (model II) not only had index registers in memory (reasonable, since it was a memory-to-memory machine), but it had two software-selectable "banks" of them. "Software-selectable" meaning the program could select one bank, the other bank, or *neither* bank of index registers. One could also programatically turn indirect addressing on or off. And, of course, it used base-10 arithmetic -- none of this binary nonsense! Interesting machine. -- John G Dobnick Computing Services Division @ University of Wisconsin - Milwaukee INTERNET: jgd@csd4.milw.wisc.edu UUCP: <backbone>!uwvax!uwmcsd1!jgd "Knowing how things work is the basis for appreciation, and is thus a source of civilized delight." -- William Safire
Technical Details
Message-ID:
<3602@csd4.milw.wisc.edu>Path:
arc1-ca.pugleaf.net!utzoo!attcan!uunet!cs.utexas.edu!csd4.milw.wisc.edu!jgd@csd4.milw.wisc.eduReferences:
<8907281547.AA28878@maxwell.ece.cmu.edu>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!cs.utexas.edu!csd4.milw.wisc.edu!jgd@csd4.milw.wisc.edu From: jgd@csd4.milw.wisc.edu (John G Dobnick) Newsgroups: comp.arch Subject: Re: Registers in memory Message-ID: <3602@csd4.milw.wisc.edu> Date: 29 Jul 89 06:13:39 GMT References: <8907281547.AA28878@maxwell.ece.cmu.edu> Sender: news@csd4.milw.wisc.edu Reply-To: jgd@csd4.milw.wisc.edu Lines: 21