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It seems to me that FDT needs the universal flash programmer board, that, maybe, it's only a max232 .... but someone has the schematics or eventually the firmware if it contains PLD or CPU's ?
the schematic can be found at the datasheets of the eval-boards but in deed it has a cpu on it and Hitachi was not willing to give me the bin or hex to programm a selfbuilt board.
Once I've seen a board with just standard ttl on it but i can't remember where and couldn't even find it again....Sorry.
But all the processor does is to set Reset and mode and all the other pins according to the Hitachi-programming manual. The rs232-signal can be pushed through over a level-converter I think.
Hope this helps a bit,