Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!samsung!rex!wuarchive!kuhub.cc.ukans.edu!caen!hellgate.utah.edu!fcom.cc.utah.edu!npd.novell.com!newsun!rbailey From: rbailey@kinetics.com (Robert Bailey) Newsgroups: comp.sys.mac.hardware Subject: Re: Comparing the Mac+ and SE Message-ID: Date: 8 May 91 11:14:14 GMT Sender: news@novell.com ( Lines: 27 The News Manager) Nntp-Posting-Host: plasma Reply-To: rbailey@wc.novell.com Organization: Novell, Inc. References: <764@newave.UUCP> <1068@eplunix.UUCP> <1991Apr26.191830.18589@visix.com> <13304@goofy.Apple.COM> Distribution: usa Date: 3 May 91 01:25:40 GMT In <13304@goofy.Apple.COM> lsr@Apple.com (Larry Rosenstein) writes: >I thought that some of the speed >improvement of the SE vs. the Plus was that fewer CPU cycles were stolen by >the video on the SE. I think that the Plus uses a 16-bit shift register that has to be filled every 4 memory cycles, while the SE uses a 32-bit shift register that only has to be filled every 8 cycles. This gives you 7/8 of your memory bandwidth instead of 3/4. I think this completely accounts for the reported ~15% performance increase of the SE. Of course, the SE has other significant advantages as well... Robert Bailey rbailey@wc.novell.com =============================================================================== Robert Bailey Voice: (415) 975-4500 Novell, Inc. Internet: rbailey@wc.novell.com 1340 Treat Blvd. Suite 500 UUCP: ucbvax!mtxinu!kinetics!rbailey Walnut Creek, CA 94596 ===============================================================================