On Fri, 14 Nov 2014, Shawn Highfield wrote to mark lewis:

 SH>   Got it. ;)  Once I got rid of the OS/2 based mailer and just had
 SH> Ezycom answer the "phone" the comport was able to share.  So
 SH> working fine now.  Just thought I'd let you know.

ahhh! perhaps you need to use the '-' in your comport definition line in config.sys?


DEVICE=X:\SIO160D\SIO.SYS (COM1,3F8,4,-) (COM2:115200,2F8,3,-)
(COM3,INTERNET:3E8,NONE:4,-) (COM4,INTERNET:2E8,NONE:3,-)
(COM5,INTERNET:1F8,NONE:3,-) (COM6,INTERNET:1E8,NONE:3,-)
(COM7,INTERNET:4F8,NONE:3,-) (COM8,INTERNET:4E8,NONE:3,-)


or perhaps it is setting SIO_Share_Access_With_OS/2 but then, reading this,
i'm not sure...


  "SIO_Share_Access_With_OS/2"  This DOS setting defaults to ON and
  it applies to all communications ports used by the DOS session.
  When ON, SIO will allow an OS/2 session to access a
  communications port which the DOS session first opened (and has
  not closed).  If set to OFF, then the DOS session will have
  exclusive use of the communications port(s) that it uses.

  This setting does not apply to a second DOS session attempting to
  access a communications port,  two different DOS sessions are
  never allowed to access the same port at the same time.
  Additionally, this setting has no affect upon the access to a
  communications port which is first opened by an OS/2 session.


the last part of the last paragraph seems to say that you are correct about
the os/2 mailer being in the way... i use both FD/2 and FD but have never
done the os/2 door thing as noted previously...

interesting find... you've written it down for when you need it in another
20 years, right? ;)

)\/(ark