In the K1EL Winkeyers there are actually three ultimatic priority modes. This is shown in the table below that comes from page 9 in the specification for the command for setting the PINCFG Register. (K1EL CW Keyer IC for Windows Winkeyer2 v23 10/5/2010). This is a de facto standard for interfacing to and controlling a keyer, as an example it is used in the K3NG Arduino Open Source Morse keyer.
My proposal is that the bits for the ultimatic mode be used like this:
- 00 - Last paddle priority, i.e normal ultimatic
- 01 - Dah priority
- 10 - Dit priority
- 11 - First paddle priority or Single Paddle Emulation (New)