16550 - A TPBoard utility for toggling the 16550's FIFO buffer

USAGE:  16550 [1-4] [on/off/?]

     Where '1' thru '4' is the COM port,  'on' or 'off' will toggle
     the FIFO buffer's state, and '?' will show it's status. Turning
     the buffered mode on is guaranteed to lock up your system if you
     are using OpusCom, and may cause problems with other programs.
     It WILL work with X00 version 1.09b, TPBoard, and ProComm Plus.

Toad Hall Tweak, 19 Apr 90
  Removed "Turbo Professional" compile requirements,
  other tweaks.
  No functional changes.

v1.3, 29 Mar 91
  Finally found some code (on the FIDO Assembly Language echo)
  to identify 16550-family UARTs.
  Threw in a new function so we only go fiddling FIFO buffers of the
  16550 UART.  (Does a 16450 have a FIFO buffer?)

  Sorry, no way to test this myself, being the owner of a mere 8250.
  (Well, it *does* identify that 8250 anyway!)

  David Kirschbaum
  Toad Hall