Subj : Re: 38400+ Rate Using bioscom or _bios_serialcom
To   : borland.public.cpp.borlandcpp
From : Ed Mulroy
Date : Mon Aug 01 2005 06:44 pm

You cannot communicate even at 9600 baud with bioscom.  That function is a 
thin wrapper which uses the serial I/O routines provided by your computer's 
motherboard.  _bios_serialcom is the same thing, just couched in a syntax 
familiar to those who migrated to the Borland compiler from Microsoft's 
compiler.  The routines are polled instead of interrupt driven and will miss 
received data.

The accepted way to do serial communications under DOS is with assembly 
language.  If you are using bioscom then you are probably not an assembly 
programmer, but if your machine is reasonably fast, not the 4.77 MHz type 
common way back when DOS was not yet obsolete, you will probably be able to 
get away with using C/C++ to do it.

Borland's Technical Information document TI445 contains serial 
communications code in C/C++.   A link to it is below.

ftp://ftp.nsk.su/pub/text-doc/ti/bc_cpp/ti445.zip

..  Ed


> frannie wrote in message
> news:42ee92bd$3@newsgroups.borland.com...
>
> Hi! I am using BC++ 4.52 for a DOS program to communicate
> via serial.  The description of the usage for both bioscom and
> _bios_serialcom commands max out at a 9600 Baud Rate
> setting. How do I set the baud rate at 38400, if at all possible?

.