Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!hayes!tnixon
From: tnixon@hayes.uucp
Newsgroups: comp.dcom.modems
Subject: Re: Re:Suitable serial card for H/S modem
Message-ID: <3802.27c53d6a@hayes.uucp>
Date: 22 Feb 91 15:48:58 GMT
References: <3787.27c196cc@hayes.uucp> <1991Feb20.205335.410@miavx2.ham.muohio.edu>
Organization: Hayes Microcomputer Products, Norcross, GA
Lines: 23

In article <1991Feb20.205335.410@miavx2.ham.muohio.edu>,
tgkreimer@miavx2.ham.muohio.edu (Tom Kreimer) writes: 

>> HAYES sells a serial port called ESP(tm) which stands for Enhanced Serial 
>> Port.  This IBM compatible serial port comes with two DB-9 serial ports and 
>... 
> Would this allow for high speed backgound file transfers from Microsoft 
> Windows? Some comminications software for Windows discourages this.

The reason background high-speed transfers are discouraged in MS 
Windows is that it is cooperative, rather than pre-emptive, 
multitasking system, and you can suffer serious data loss problems.  
ESP solves this by providing automatic flow control right on the 
board.  It also provides DMA, so the interrupt processing overhead 
is greatly reduced, making background communications feasible.  Both 
of these features are supported by Hayes' Windows 3 serial driver, 
now in beta test and available very soon.

-- 
Toby Nixon, Principal Engineer    | Voice   +1-404-840-9200  Telex 151243420
Hayes Microcomputer Products Inc. | Fax     +1-404-447-0178  CIS   70271,404
P.O. Box 105203                   | UUCP uunet!hayes!tnixon  AT&T    !tnixon
Atlanta, Georgia  30348  USA      | Internet       hayes!tnixon@uunet.uu.net