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000086_news@newsmaster….columbia.edu _Wed Jan 6 05:30:19 1999.msg
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From: Terry Kennedy <terry@spcunb.spc.edu>
Subject: Re: Help-CP/M to Mac Xfrs fail
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Frank da Cruz <fdc@watsun.cc.columbia.edu> writes:
> However, sending to the Mac should not be as problematic as sending to CP/M,
> since CP/M tends to "cut out" for long periods of time while writing to the
> disk.
I've got to make a comment here, since I used to design boxes running CP/M
(and stranger flavors - the company I was with had the only MP/NOS licenses
ever issued).
It's perfectly possible to make hardware that could sustain very high input
and output rates. All that's needed is interrupt-driven input and output and
buffers larger than a Kermit packet. A DMA-based disk controller also helps
(otherwise interrupts tend to be disabled for long-ish periods of time).
As an example, A. C. Clarke's "2010 - Odyssey 2" was entered for typesetting
by 4 operators (the other 2 were doing one of the Gardiner Bonds) on one of my
MP/M designs, with a single 4MHz Z-80, with WordStar, in an afternoon. My later
designs used a processor for each user which greatly simplified the interrupt
system (at the expense of much more complicated synchronization between the
processors).
We now return you to your regularly scheduled Kermit questions 8-}
Terry Kennedy Operations Manager, Academic Computing
terry@spcvxa.spc.edu St. Peter's College, Jersey City, NJ USA
+1 201 915 9381 (voice) +1 201 435-3662 (FAX)