In a message to All , Gary Chambers writes:

 GC> What am I supposed to do when I query the baud rate of the  comm port
 GC> and it's locked at 115.2kbps?  Specifically,  DosDevIOCtl(IOCTL_ASYNC,
 GC> ASYNC_GETBAUDRATE, ... ) returns  (supposedly) only USHORT; how do I
 GC> get the actual baud  rate, if it's above 65535 (sizeof(USHORT)) bps? 
 GC> Thanks...


ASYNC_GETBAUDRATE is function 61h.  You need to use function 63h (IBM forgot
to give it a name in bsedev.h).  This function is called Extended Query Bit
Rate.

This function returns the extended query bit rate in doublewords for a  bit
rate greater than 19200 bits per second (bps).  If a general failure is not
returned, the physical device driver returns  the bit rate values as
defined. This function is extended from the  current Function 61H - Query
Bit Rate. 


Parameter Packet Format: 
     None.  Packet pointer must be 
     NULL. 

Data Packet Format: 

Field               Length  Current Bit Rate    DWORD  Fraction of Current
Bit Rate 
                    BYTE  Minimum Bit Rate Supported 
                    DWORD  Fraction of Minimum Bit Rate  Supported          
BYTE  Maximum Bit Rate Supported 
                    DWORD  Fraction of Maximum Bit Rate  Supported          
BYTE 

Let me know if you need more info (Such as on Function 43h - Set Extended
Bit Rate - you guessed it, not ASYNC_* definition in bsedev.h).






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