rcgldr Posted March 19, 2020 Share Posted March 19, 2020 (edited) This board replaces the 6301 in the keyboard, and the 6301 plugs into the board. The red and black wires go to a rechargeable battery pack. I use 3 x AA NIMH batteries (2400 mah). The board is called a "time-saver". I got this back in 1985 or 1986 when I got my 520 ST as part of a developer kit. Edited March 19, 2020 by rcgldr Quote Link to comment Share on other sites More sharing options...
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