Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site caip.RUTGERS.EDU Path: utzoo!watmath!clyde!burl!ulysses!gatech!seismo!caip!louie From: louie@trantor.UMD.EDU Newsgroups: net.micro.amiga Subject: CSA 68020 board Message-ID: <755@caip.RUTGERS.EDU> Date: Tue, 17-Dec-85 09:20:09 EST Article-I.D.: caip.755 Posted: Tue Dec 17 09:20:09 1985 Date-Received: Wed, 18-Dec-85 05:48:07 EST Sender: daemon@caip.RUTGERS.EDU Organization: Rutgers Univ., New Brunswick, N.J. Lines: 48 From: Louis A. Mamakos It just so happens that I was in San Diego last week, and I dropped by to visit the CSA folks. In case you tuned in late, they are a 68000 systems house that manufacture a general purpose 68020/68881 piggyback board that plugs into a 68000 socket. In addition, they have a version for the Amiga that also has 256K of static RAM on board. The current version (a prototype) that I played with runs at the same clock speed as the 68000 on the Amiga. I took along a copy of the Dhrystone benchmarks to beat on it with. There are three dhrystone runs: 32 bit integers without register variables, 32 bit integers with register variables, and 16 bit integers with register variables. Three test configurations were used: my standard Amiga at home, the CSA 68020 board with the 68020 cache enables, and the CSA 68020 board with cache and additional memory enabled. Standard Amiga 68020/cache 68020/cache/fast mem 32 bit/no reg 458 515 781 32 bit/reg 458 515 657 (??) 16 bit/reg 549 588 781 I cannot explain the obvious anomoly in data observed; it is possible that the data may not have gathered with the 68020 instruction cache enabled. The additional 256K of static memory is on the CPU piggyback board, and it 32 bit wide. This presumably explains the improved performence. I assume that the dhrystone program was loaded and run from the 'fast' memory. I cannot be sure. I was running an amiga booted from a plain V1.0 kickstart and workbench disk. The 'addmem' program was used to tell the system about the additional memory. CSA had a small program that enabled the 68020 cache. Rumors ------ I understand that CSA is working on a board with it's own clock (running faster that the 7.1 odd MHz). This should improve the performence considerably. CSA will be selling a version of the Amiga outfitted with their board. They will be calling it a TurboAmiga. I don't claim these numbers are correct or even reproducable. We were running with an unknown set of software and hardware. Just fooling around with the system in a few spare hours. If you want to know more about the