Date: Mon, 1 Jul 1996 12:22:27 +0200 From: kaufmann@shraero.shraero.co.at (Roland Kaufmann) To: hardware@FreeBSD.org Subject: Re: muliport boards - building a PPP dialup server Message-ID: <9607011022.AA14021@shraero.co.at>
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Michael Smith <msmith@atrad.adelaide.edu.au> wrote:
>The 16650 is a 16550 with a 32-bye FIFO. Neither are suitable for
>512KBps; at this speed you have a new byte arriving every 16us, or a
>full FIFO after only 512usec. This is too fast for anything other
>than a dedicated system.
>
>
> - A 486 can service around 40,000 ISA interrupts per second, assuming
> minimal interrupt processing time.
Now 40000 interrupts/s gives 25us between interrupts, so it should be
possible to handle several UARTS.
--
best regards
Roland Kaufmann
Roland Kaufmann roland.kaufmann@shraero.co.at
Senior Systems Engineer/Systems Design Phone: +43 1 80199 5563
SCHRACK Aerospace Fax: +43 1 80199 5577
Breitenfurterstr. 106-108 A-1120 Vienna, AUSTRIA
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