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From: a186@mindlink.UUCP (Harvey Taylor)
Newsgroups: comp.sys.amiga
Subject: Re: Bus Speeds doc & question
Message-ID: <1890@mindlink.UUCP>
Date: 24 May 90 15:44:35 GMT
Organization: MIND LINK! - British Columbia, Canada
Lines: 37

In <11765@cbmvax.commodore.com>, daveh@cbmvax.commodore.com (Dave Haynie)
|
|In article <1990May23.021804.12469@uncecs.edu> urjlew@uncecs.edu
|(Rostyk Lewyckyj) writes:
|>In article <1843@mindlink.UUCP>, a186@mindlink.UUCP (Harvey Taylor) writes:
|
|>Since C= had just changed the bus and added the IBM/PC
|>bus, I wrote that the A3000 would use the NuBus for compatability
|>with the Mac (easy use of Mac expansion cards :-) ). Apparently
|>Mr. Haynie took the posting seriously, because he wrote me asking
|>why I thought he would use the NuBus and criticised it as being slow.

    Please note that I didn't write any of this >quoted material.

|Yeah, I remember that.  And what that table doesn't show you is that
|68030 to NuBus interface on the Mac IIs runs about 5 MB/s.

    How do you know this? I'm not doubting you in particular, I'm just
 looking for an EE101 answer to how to measure &/calculate bus speeds.

|   [...]
|                                             I suppose if I sat down and
|calculated maximum theoretical Zorro III speed, I'd tell you that it maxes
|out at 50 MB/s for a standard full cycle, over 150 MB/s for a full burst
|cycle.  But that's simply based on the specification;
|
|   [...]
|That says nothing about how fast other bus masters might go, nor how fast a
|future Amiga may be able to drive Zorro III.

   Same questions...

 "Accurate reckoning - the entrance into the knowledge of all existing
        things and all obscure secrets." -Ahmes the scribe, ca.1700 BC
      Harvey Taylor      Meta Media Productions
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