MGETBYTE() (INTEGER)

 Function
  Get the next byte input from the modem.

 Syntax
  MGETBYTE()   No arguments are required

 Return Type & Value
  INTEGER
  Returns the value (0-255) of the next byte from the modem input buffer
  or -1 if no bytes are pending.

 Remarks
  Any character may be received from the users modem.  Normally PCBoard
  will filter and convert strings (ESC sequences and DOORWAY codes)
  automatically.  However, sometimes this isn't desired and you need to
  access the incoming bytes directly.  This function will look directly
  for incoming characters from the modem and return them as a value from
  0 to 255.  These numbers may be converted to characters with the CHR()
  function if necessary.

 Examples
  INTEGER byte
  WHILE (byte <> 27) DO
    LET byte = MGETBYTE()
    PRINTLN "The byte value is ",byte
  ENDWHILE