The Data Handler is a SBC (actually two boards!) built in 1975 by Western Data Systems Corporation.
One of the first computers based upon the then new 6502, as the KIM-1. Jolt, OSI 300.
Photos and blog about this SBC by Armin Zink, who owns a Data handler.
With the help of users on the German Classic Computing forum I ahve added many manuals and magazines in german about tho...
Another article from the Dutch KIM Kenner magazine: RECORDING PROGRAMS WITH THE KIM-1 AND THE CASSETTE RECORDEROrigin...
Stephen Crozier made a clone of the Unilab Three Chips main board.
Thanks to Mathias Ohlerich for the scan of the Sonderheft 2