Incompatability with A and B boards

Problem environment

The device connects to its B+ type host with a 40-pin connector part J3, and therefore cannot connect to 26-pin A and B boards.

Steps to reproduce

1. Refer to the layout
2. Locate part J3 and review its pin configuration

Expected result

Documentation states an incompatability with 26-pin host models, namely A and B boards.

Actual result

Documentation makes no claim of incompatability with A and B boards.

Severity level

This is medium priority because some users may expect to use an older A or B board.

The 26-pin connector format is old enough that we may disregard it and assume those interested in 26-pin connection must request support information independently.