CG>
  > I can't even lock the port at a different  rate.  :)
CG>

  When a port is "locked", the BPS rate cannot be changed by an
  application program.

  The SIO.SYS serial device driver for OS/2, for example, allows you to
  lock ports at a given BPS rate by using arguments to the DEVICE=SIO.SYS
  line in CONFIG.SYS.  When SIO.SYS initialises, it reads the command
  line, sets the BPS rate to the one specified, and then ignores all
  attempts to change the BPS rate for that device thereafter.

  If an application can change the BPS rate of a serial device, then the
  device is not, by definition, "locked".

CG>
  > ULONG baud=115200;
  >
  > rc = DosDevIOCtl(FileHandle, 0x01, 0x43, &baud, 4L,
&FileSize, NULL, 0L
  >          &SizeInOut);
CG>

  Your parameter packet is wrong.  The parameter packet comprises two
  fields, a rate field and a fraction field, as described in the on-line
  reference for DosDevIOCtl.

CG>
  >     So for function 0x43 in DosDevIOCtl for catagory 1, the ParmList is
  > supposed to contain a "dword" (long baud=xxxxxx) and a
"byte" (char
  > divisor=xxxx)?  IF this is the case, how do you pass both of those as one
  > parameter?  Use a structure?
CG>

  Yes.

  > JdeBP <
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