KDIC/KDIC DA should work on Palm OS 2.0 or later.
Machines (shold work):
Palm m515, m505, m500, Vx, m105, m100, IIIc, PalmPilot Personal,
     PalmPilot Professional, III, IIIx, IIIe, V, IIIxe, VII, VIIx
IBM WorkPad c505, 50J, 40J, 31J, 30J, 10U, 20U, 30U, 40U, 50U
Visor Prism, Edge, Plutinum, Deluxe, Solo, Treo Series
Sony PEG-S300, PEG-S500C, PEG-N700C, PEG-N710C, PEG-T400, PEG-T600C
     PEG-T650C, PEG-N750C,
     PEG-NX70V, PEG-NX60, PEG-SJ30, PEG-NR70V, PEG-NR70

** Important **
You need to install J-OS (Japanese OS) or CJKOS to display/input Japanese
characters on English version of Palm-OS.
You can purchase J-OS from:
Inside of Japan
Outside of Japan
Or, you can purchase CJKOS from:
My environment
I'm testing KDIC on PalmV(English) + J-OS-IIIx, Sony Clie PEG-N700C.