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- 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.
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