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6) With the carriage now at the right-most position along the X shafts and the pen in the same position (as above in #4 and #5) along the Y shafts. Now, back-to-front (opposite of #5) pressure on eit
Okay, column #5 - the column directly under LED D4, is really "Row 4" in the matrix, starting with row 1 on the top (your right hand side) and working down. Row 4 is at pin 23 of the LED mat