Both the PSP and Millenium setting are rampingmodes capped at 15.4bps.
The Zero B board has the exact same programming. Some of the later flash versions (1.20 I think) had minor tweaks like calling them "ramp 1" and "ramp 2", but they were fundamentally the same.
The ramp activation only kicks in at 3 trigger pulls at 5pps though.
Tadao ran out of boards ages ago. 2nd hand they are the same price as new.
You may get a kick out of this: