Revision 2.3 (12/07/22)
     - When in the configuration monitor, AND off the parity bit and
       do not buffer control characters on console input

Revision 2.2 (11/10/22)
     - Print / for % and & for @ on the Teletype

Revision 2.1 (08-07-22)
     - Add parameter for voltage boost and unshift-on-space. Use LTRS for CR
       timing instead of NUL.

Revision 2.0 (4-22-22)
     - Update for version A PCB with boost circuit

Revision 1.0 (1-1-22)
     - Prototype