Electronics Barn closing

[David V. Corbin]

Ahh, but were you USING DOS [API services] for perfoming the Serial I/O or
were you bypassing it and going to a lower [BIOS or Hardware] level......

That is the crux.....

DOS did NOT work well (IIRC and others seem to agree) for serial I/O
DOS was NOT a protected OS and allowed direct access to lower layers..

Therefore you could write good serial IO on a machine that was RUNNING dos,
but you could NOT write high performace routines USING dos.....

>>> -----Original Message-----
>>> From: cctalk-bounces at classiccmp.org 
>>> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Vintage 
>>> Computer Festival
>>> Sent: Tuesday, August 03, 2004 2:04 AM
>>> To: General Discussion: On-Topic and Off-Topic Posts
>>> Subject: Re: Electronics Barn closing
>>> 
>>> On Mon, 2 Aug 2004, ben franchuk wrote:
>>> 
>>> > Joseph S. Barrera III wrote:
>>> >
>>> > > Don't be silly. Of course DOS has interrupt handling. See e.g.
>>> > > <http://webster.cs.ucr.edu/AoA/DOS/ch17/CH17-4.html>
>>> >
>>> >
>>> > Well I guess you have never used a SERIAL PORT under DOS!
>>> > Can we say 300 BAUD!
>>> > Grumpy PROGRAMER!
>>> 
>>> I designed a state-machine based application that handled 3 
>>> serial ports (mutli-port serial card sharing on interrupt) 
>>> simultaneously downloading data files at up to 19.2Kbps per channel.
>>> 
>>> I also designed a system that used 2 standard COM ports 
>>> simultaneously:
>>> one for remote access and one for transferring data.  
>>> Worked fine at up to 19.2Kbps (the fastest cheap modems of 
>>> the day, e.g. USR Sportsters).
>>> 
>>> Under MS-DOS 6.22.
>>> 
>>> So I have no idea what you're talking about really :/
>>> 
>>> -- 
>>> 
>>> Sellam Ismail                                        
>>> Vintage Computer Festival
>>> ------------------------------------------------------------
>>> ------------------
>>> International Man of Intrigue and Danger                
>>> http://www.vintage.org
>>> 
>>> [ Old computing resources for business || Buy/Sell/Trade 
>>> Vintage Computers   ]
>>> [ and academia at www.VintageTech.com  || at 
>>> http://marketplace.vintage.org  ]
>>>