The address "issue" is actually quite simple.? I2C addresses are comprised of 7 bits and in use are followed by a read/write bit which is 0 for write and 1 for read.? As the firmware only writes and never reads, the designer chose to add the write bit into the address.? So if your display address is hex 27 for example, this is 0010 0111 in binary, add a zero for the write bit and the address becomes 0100 1110 which is hex 4E, bingo.? Another example hex 3c (0011 1100) becomes hex 78 (0111 1000).?
Hope this helps.
