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In article <KHP.92Aug6101224@spirot.MicroUnity.Com> khp@MicroUnity.Com (Kevin Peterson) writes:
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>From: khp@MicroUnity.Com (Kevin Peterson)
>Newsgroups: comp.sys.ibm.pc.misc
>Subject: PC/AT bus bandwidth
>Message-ID: <KHP.92Aug6101224@spirot.MicroUnity.Com>
>Date: 6 Aug 92 17:12:24 GMT
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>Distribution: comp
>Organization: MicroUnity Systems Engineering, Inc.
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>Nntp-Posting-Host: spirot.microunity.com


>Hi,

>I am trying to find out how fast I can transfer data to a 16 bit PC/AT
>card, either with program IO or with DMA.  I'm interested in both
>transfer from memory as well as from a typical hard disk, assuming the
>microprocessor is a 20 MHz 386. Any insight from those with experience
>would be greatly appreciated!

>-Kevin
>--

Depends a lot on *your* system.  Some systems have as little as 1 or as
many as 3 wait states on the IO bus, plus there are bus clocks from 8 to
33 MHz, again depending on the BIOS and board maker.  For a standard AT
bus, you're looking at a top rate of about 1 MB / sec.
                                                                                        "This must be Thursday.  I never could get the hang of Thursdays"                                                                     - D Adams
  - Patrick Taylor
    Ericsson Network Systems                                                        exuptr@exu.ericsson.se             "Don't let the .se fool you"                 alternately, exuptr@ZGNews.Lonestar.Org