nullmodem.device is a software device, that imitates two modems and a phone
line, on one machine. I wrote it whilst looking at the WPL scripting
language,  so that I could play around without having to spend any money on
expensive  phone calls,  but it can be used for testing various other
programs.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  603    1004  60.1% -lh5- adad Apr 15  1994 NullModem/.Product-Info
[generic]                 4388    8064  54.4% -lh5- 09e1 Apr 15  1994 NullModem/nullmodem.device
[generic]                 3491    8894  39.3% -lh5- e401 Apr 15  1994 NullModem/NullModem.doc
[generic]                 1284    6126  21.0% -lh5- 15e2 Apr 15  1994 NullModem/src/cmd.c
[generic]                  329     584  56.3% -lh5- a872 Apr 15  1994 NullModem/src/debug.c
[generic]                  998    2739  36.4% -lh5- d71d Apr 15  1994 NullModem/src/defs.h
[generic]                 2575    8518  30.2% -lh5- 107b Apr 15  1994 NullModem/src/device.c
[generic]                  716    1713  41.8% -lh5- 1da8 Apr 15  1994 NullModem/src/DMakefile
[generic]                  938    2070  45.3% -lh5- 8135 Apr 15  1994 NullModem/src/init.c
[generic]                 3578   15142  23.6% -lh5- b00a Apr 15  1994 NullModem/src/modem.c
[generic]                   59      72  81.9% -lh5- b194 Apr 15  1994 NullModem/src/nullrev.h
[generic]                  505    1860  27.2% -lh5- 4af1 Apr 15  1994 NullModem/src/protos.h
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        12 files   19464   56786  34.3%            Apr 26  1994