Saw this:
LC0BD  bita  #$01    * CHECK TO SEE IF ACCD IS ON AN EVEN
       beq   LC0C2   * 512 BYTE (ONE GRAPHIC PAGE) BOUNDARY - ADD
       inca          * 256 (INCA) TO IT IF NOT
LC0C2  tfr   A,B     COPY ACCA TO ACCB
Why not just:
       inca
       anda  #$FE
       tfr   A,B
Juan