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 ]
>>>
Received on Tue Aug 03 2004 - 01:25:50 BST