Re: Memory/Modem

To: dewar@schonberg.cs.nyu.edu (Robert Dewar)
Subject: Re: Memory/Modem
From: Keith Moore <moore@cs.utk.edu>
Date: Mon, 31 Jan 1994 12:54:58 -0500
Cc: tp750@cs.utk.edu, ychou@uxa.cso.uiuc.edu, moore@cs.utk.edu
In-Reply-To: Your message of "Mon, 31 Jan 1994 08:07:37 EST." <9401311307.AA02139@SCHONBERG.CS.NYU.EDU>
Sender: moore@cs.utk.edu

> does anyone actually *know* that the difference between the 16450 and 16550
> PCMCIA modems is real? Of course I understand the effect of the difference
> in the case of a normal serial port, but here we are talking about a
> simulation, and it is not technically obvious to me at all that the fact
> that the external simulated interface is 16450 will make it impossible to
> do "_ANY_" multitasking at all. comments?

If the modem has to interrupt the cpu 1440 times a second, it certainly
eats up a lot of the time available for other things.

By contrast, a properly-programmed simulated-16550 would only interrupt the
cpu one sixteenth of that time.

Keith

References:
- Re: Memory/Modem
  - From: dewar@SCHONBERG.CS.NYU.EDU (Robert Dewar)

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