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- Comm: a communication program for the IBM-PC
-
- Comm is a minimal dumb terminal emulator for the IBM-PC under PC-DOS. It uses
- BIOS function calls for keyboard input, allowing all control characters to be
- sent with the conventional keyboard sequences. It uses an interrupt handler for
- the communication port, functional up to 9600 baud. It is written in C with
- assembler routines to handle I/O. It only supports the first asynchronous port,
- COM1:. It doesn't support setting the communication parameters. This can be
- done with the DOS "mode" command. The port IS NOT DISABLED (DTR is not dropped)
- when the program is terminated; you must disconnect from the remote computer in
- some other fashion. As a result, however, you can exit to DOS, make use of any
- DOS commands which don't tinker with the communication port, and resume the
- terminal session, without any disruption visible at the other end (characters
- sent to the PC will be lost in the interim). Best of all, it is small. It
- supports very few commands, all of which are alt sequences:
-
- alt-e is a toggle: it turns echoing on and off (default off). This can be used
- for half-duplex systems.
-
- alt-v is a toggle: it turns verbose mode on and off (default off). In verbose
- mode characters which are normally non-printable and aren't "carriage
- control" characters print as "^x", where "x" is the character you would
- hit to send the control character. Otherwise such chaff is ignored.
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- alt-b sends a break (approx. 300 ms. of line high)
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- alt-q quits the program, and returns to DOS
-