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On the shim's bus connector footprint, pin 1 is labelled "A11" and has a square pad (all the others are round). Use an unboxed 40 way right angled pin header for this, as shown in the photos on this page, or you may find space is too tight inside the computer, and check the orientation of the header and cable is correct before soldering the header in. The header should be fitted to the top side of the board, as shown in the shim pictures.
=== uIDE-16 fix for 8-bit mode ===