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From: bb16@prism.gatech.EDU (Scott Bostater)
Newsgroups: comp.lang.pascal
Subject: Re: Setting up the COMMS ports using Turbo Pascal
Message-ID: <18137@hydra.gatech.EDU>
Date: 5 Dec 90 12:58:18 GMT
References: <4805@gara.une.oz.au> <1990Dec5.121609.10113@csc.canterbury.ac.nz>
Organization: Georgia Institute of Technology
Lines: 29

In article <1990Dec5.121609.10113@csc.canterbury.ac.nz> phys169@csc.canterbury.ac.nz writes:
>In article <4805@gara.une.oz.au>, cfraser@gara.une.oz.au (Colin Fraser BEST) writes:
>> I would like to set up the comms port on my AT-compatible using
>> TP. The manual indicates how to do this for baud rates up to
>> and including 9600. However, I'd like to use a baud rate of
>> 19200, and so I can't use the interrupts as in the example.
>> 
>You have to program the registers yourself, but be warned: high baud rates can
>result in data loss on input, unless you go to the effort of installing an
>interrupt service routine to buffer incoming bytes. The following program
>probably does a bit more than you need...

[program code deleted]

If you want high data rates, I'd suggest using a FOSSIL driver (a device 
driver) to handle the interrupt service routines.  You can then perform simple
interrupt calls (almost identical to the BIOS calls) to do the serial I/O and
not have to worry about losing data.  Fossil supports data rates up to 38400
baud.

If you're interested, I've already written a FOSSIL unit to handle the 
interface from TP to the device driver.  I'll be happy to e-mail you a copy.


-- 
Scott Bostater      Georgia Tech Research Institute - Radar Systems Analysis
"My soul finds rest in God alone; my salvation comes from Him"  -Ps 62.1
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