V8/usr/man/man9/c56.9

.TH C56 9.1
.SH NAME
c56 \- terminal program with data compression
.SH SYNOPSIS
.B c56
.SH DESCRIPTION
.I C56
replaces the program in the layer on its standard output with
an emulator for a
Teletype DMD 5620 stand-alone terminal.
In the resulting layer, environment variable TERM is set appropriately.
The character stream from the host to the terminal
is compressed using an adaptive algorithm
that often doubles the effective data rate of
a slow host-terminal connection.
.PP
This terminal program is most useful at speeds of
2400 baud and below.
At 9600 baud, the terminal cannot generate
characters and put them on the screen fast enough
to keep up, and the extra overhead introduced by
decompression just slows things down.
.SH BUGS
Unexported shell parameters and functions are lost.
.br
Race conditions occasionally leave the tty modes set
improperly at start-up.