COMSET
                                By David Macchia

             Comset  will install com ports 3 and 4 in the DOS bios  area 
        for IBM PC, XT, AT's and compatibles.  The power on self tests on 
        these  machines  only  tests for the presence of  the  first  two 
        serial  ports,  and  as  a result  any  program  which  uses  DOS 
        functions  cannot  access ports 3 and 4.  DOS  versions  3.3  and 
        above  supports COM3 and COM4 as devices, and after using  comset 
        you  may use the MODE command and redirection of output to  these 
        ports.

             Most programs which support COM3 and COM4 do so by using the 
        actual  device  addresses  rather than the  DOS  function  calls.
        However  those  which  go thru DOS cannot "see" ports  3  and  4.  
        Many  programs will not allow selection of any port  above  COM2.  
        To  get  around  this there are a couple  of  companion  programs 
        included  with this package which will swap the com ports in  the 
        DOS  bios area.  They are called COMSWPxy.COM, where x and y  are 
        the ports which are swapped (ie: COMSWP14.COM will exchange ports 
        1 and 4).

             Swapping the ports will allow you to access these ports, but 
        will  not affect the use of them by direct access programs.   For 
        instance  I have my modem installed as COM4 and have  swapped  it
        with  COM1.   Sidekick and Async are configured as  COM1,  while 
        Procomm  and  Xtalk are still configured as COM4.   My  mouse  is 
        actually  connected to the physical COM1, and uses direct  access 
        so is configured as COM1.  This may sound complicated, but I just 
        COMSET  and  COMSWAP14  in my autoexec.bat  file  and  everything 
        works.

             A few notes:

        1)   Physical  ports 1 and 3, use the same interrupt as do 2  and      
             4. If you are using a mouse on one of the ports you probably
             will  not  be able to run a communications  program  on  the
             other as the are both usually interrupt driven.

        2)   Using  Sidekick's dialer may require the use of  the  public
             domain program called SKFIX.COM, which is available on  most
             bulletin boards, to fool Sidekick into thinking DSR is high.
             If you are using version 1.52 you may find you will need  to 
             patch  out  address  xxxx:8BB6 from 74 F0 to  90  90.   This 
             worked  for  me, and really has nothing do do  with  comset.  
             SKFIX  will  also  allow you to send  stuff  to  your  modem 
             through DOS redirection such as "TYPE SETUP.TXT >  COM4:" to 
             send  the contents of setup.txt to the modem even if DSR  is 
             low.