   When I first started using PCLINK software to download data from my CASIO BOSS M10 to my PC, the download function just would not work in OS/2, even though it worked fine in DOS.  The software part of PCLINK worked fine under OS/2, but for a long time I was sure I would never download under OS/2.  It took a lot of trial and error until I got it to work properly.  In an effort to help someone else who might run into the same problem I am enclosing here the pertinent part of my settings which make PCLINK downloading work just fine under OS/2.  Please note that I use SIO here to replace IBM's OS/2 default drivers (COM.SYS and VCOM.SYS) but the same generic settings would work without SIO using IBM's OS/2 default com.sys and vcom.sys.
 
    Basically this disables access to 3 of the COMs and only allows access to the one used for the communication (COM 2 in my case).  The hardware timer is enabled.
    
HW_TIMER=1
SIO_Allow_Access_COM1=0        
SIO_Allow_Access_COM3=0
SIO_Allow_Access_COM4=0
SIO_Virtualize_COM_Ports=0
SIO_Virtualize_16550A=0
PATH=
COMSPEC=C:\OS2\CMD.EXE

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