Serial port speed

From: Fred Cisin <>
Date: Mon Aug 2 23:14:23 2004

> > Don't be silly. Of course DOS has interrupt handling. See e.g.
> > <>

On Mon, 2 Aug 2004, ben franchuk wrote:
> Well I guess you have never used a SERIAL PORT under DOS!
> Can we say 300 BAUD!

Hmmmm. I was able to get 9600 bits per second out of the IBM
serial card (8250 UART) on 4.77 MHz PCs, without TOO much difficulty.

One of the nice things about MS-DOS, as opposed to the W word,
was that it wasn't very hard to shove it out of the way when
you wanted to talk to the hardware.
("well behaved" v performance)

But, admittedly, if you tried to do serial I/O using the BIOS
routines, then you might very well be limited to not much over
300 baud.

Joe Campbell's "C Programmer's Guide to Serial Communications"
has plenty of good info, although he and I didn't completely
agree about his level of "data hiding".

Grumpy Ol' Fred
Received on Mon Aug 02 2004 - 23:14:23 BST

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