SIO2K revision history

09-18-01 - Version 2.00a
     First public release.

09-20-01 - Version 2.00b
     IoCtl function 72h was incorrectly setting bit 2 (xmit buffer empty). 
     This problem has been corrected.

     Corrected a problem in the install script (install.cmd).

10-04-01 - Version 2.00c
     The 16950, rev 0, is no longer rejected.  Instead a warning is placed
     into the log file.

     Send and receive buffers are now always cleared upon an open call. 
     Previously, they were not cleared if DCD was active.

     Changed default of OCTS to off.

     The "NoProbe" option turns out NOT to be a good idea.  It has been
     removed.  My apologies to those that will have to edit their
     config.sys file to remove the option.

     Corrected an error in the automatic irq detection routines.  This
     problem would cause "already open" ports to die.  The problem only
     occurred the first time a port was opened following a boot.

     Corrected a problem that caused a slow exit on many apps.

10-15-01 - Version 2.01
     Added pmlm hooks and created a pmlm.exe for sio2k.  Pmlm.exe is now in
     the distribution zip.  The pmlm implementation is considered beta at
     this point.

     Corrected a problem that caused some internal modems to fail to work. 
     This problem shows up with programs that use unusual modem
     initialization procedures, like In-Joy.