Bit Banger

When a serial port uses the null_modem device, the -bitbanger (-bitb) option is made available.

-bitbanger's argument may be:

• file -- opens a file
• socket.hostname.port -- Opens a tcp connection. This is raw connection; any protocol (telnet, ssh, etc) needs to be handled by the guest).
• /dev/pty (Apple) or /dev/pts (Unix) -- Attaches it to a new pseudo terminal (pty). I don't believe you can easily determine which pty it is, so using pty device directly is a better option.
• domain.pathname (Apple, Unix) -- Opens a UNIX domain socket.
• \\.\pipe\pipename (Win32) -- Opens/Creates a named pipe.

See also:

• Using MAME to Emulate the Apple II+