CPU/Hardware info for Seiko UC-2000

Hi all -- Got myself a Seiko UC-2000 ("Wrist Information System") w/UC-2200 keyboard/terminal. The UC-2000 is a souped-up digital watch with a dot-matrix display, and the Keyboard unit is basically a computer that uses the watch as a display. (So it's more or less like the old Sharp/Casio BASIC programmables, only it uses a watch for a display instead of something built-in...) But the watch itself is _also_ a small computer -- one can upload small binary programs from the Keyboard unit to the watch. From the little information I've been able to find, it has 2k of RAM, 7k of ROM, and a 4-bit CPU running at 32kHz (yes, kHz). Does anyone know anything about the CPU? It'd be fun to write some little programs for this (assuming I can work out how to get them transferred over...) (See http://www.pocketcalculatorshow.com/nerdwatch/fun2.html for a brief description of the UC-2000 and others in the same family...) Josh