I have several different USB to PS2 converters and none will work on any of the WEBDTs that I have. On the other hand, all USB keyboards that I have tried work with no issues.
DT Research sells this keyboard as part of the their accessory line ACC-003-06.
"BTC model 9118" so it would certainly work. google will show you many vendors.
Here's a link to the accessory list:http://www.dtresearch.com/product/datas ... 070419.pdf
I have several cases for sale with said keyboard, mouse and four port hub model ACC-010-09.
Contact me via private email if interested. -Dave