Start a terminal-emulator for a serial port in a new buffer.
PORT is the path or name of the serial port. For example, this
could be "/dev/ttyS0" on Unix. On Windows, this could be
"COM1" or "\\.\COM10".
SPEED is the speed of the serial port in bits per second. 9600
is a common value. SPEED can be nil, see
`serial-process-configure' for details.
The buffer is in Term mode; see `term-mode' for the commands to
use in that buffer.
Uses keymap `term-raw-map', which is not currently defined.
Type C-x b to switch to another buffer.
(fn PORT SPEED)