Article View: comp.sys.dec
Article #1630Re: "RISCy VAX" ??
From: Richard Seymour
Date: Fri, 15 Jun 1990 00:28
Date: Fri, 15 Jun 1990 00:28
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another thing the DEC people are (justifiably) proud of is that the 9000 takes fewer internal cycles to execute most instructions. my vague memory of the engineer's talk was: the 780 took an average of 11 cycles to execute instructions the 9000 takes about 6 to 8 -- and they're much faster cycles. The RISCness was from breaking the data and instruction flow down, and (i believe) using faster ALUs, etc. multiple times, rather than a broad-complex path to perform the steps of execution. Sorta like the 1962 SDS 930 family (the "first" Silicon-based computer priced below $100,000. Done by using the same ALU for address and data calculations -- "Silicon cost three times as much as Germanium, so they used each part three times to reduce the part count by a factor of three".) --dick
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!uakari.primate.wisc.edu!dali.cs.montana.edu!milton!seymour From: seymour@milton.acs.washington.edu (Richard Seymour) Newsgroups: comp.sys.dec Subject: Re: "RISCy VAX" ?? Message-ID: <4146@milton.acs.washington.edu> Date: 15 Jun 90 00:28:25 GMT References: <1990Jun11.172604.22994@hayes.fai.alaska.edu> <26139@cc.usu.edu> Reply-To: seymour@milton.u.washington.edu (Richard Seymour) Organization: University of Washington, Seattle Lines: 14