Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!husc6!cmcl2!ccnysci!alexis
From: alexis@ccnysci.UUCP (Alexis Rosen)
Newsgroups: comp.sys.mac.programmer
Subject: Re: How fast can a MAC-SE drive a serial line?
Keywords: serial, fast
Message-ID: <1514@ccnysci.UUCP>
Date: 7 Apr 89 06:18:56 GMT
References: <13655@jumbo.dec.com> <28021@apple.Apple.COM>
Reply-To: alexis@ccnysci.UUCP (Alexis Rosen)
Organization: City College of New York
Lines: 29

In article <28021@apple.Apple.COM> han@Apple.COM (Byron Han,
wyl E. coyote ) writes:
>AppleTalk can operate at 256KBits/second because it is not interrupt driven
>and when the AppleTalk driver is running, it has complete control over the
>Macintosh.
>
>Serial drivers are limited to a theoretical limit of 500kbaud with external
>clocking and the serial driver having complete uninterrupted control of the
>Macintosh.
>
>Byron Han, Communications Architect
            ^^^^^^^^^^^^^^^^^^^^^^^^

It is with great trepidation that I venture to correct a man with such
a title on a subject like AppleTalk, but here goes... :-)

Minor nitpick: I thought AppleTalk ran at 230.4 kbps.

Major nitpick: Both TOPS and Dayna would be surprised to hear that their
FlashTalk and DaynaTalk products, which run at 768 to 850 kbps, can't
ever go faster than 500 kbps.

I was also under the impression that the old serial hard disks (Tecmar,
Davong, MacBottom) could do close to 1Mbps, but that's a long time ago...


---
Alexis Rosen
alexis@ccnysci.{uucp,bitnet}