Routines
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6e7c: Reverse all bits in Accumulator.
Two buffers are used for sprites facing the opposite direction so we need to flip the bits such that %00100111 becomes %11100100.
6e7c push bc Backup BC
6e7d ld b,$08 Counter of 8-bits
6e7f rrca Do the bit reversal
6e80 rl c
6e82 djnz $6e7f
6e84 ld a,c Set return value
6e85 pop bc Restore BC
6e86 ret
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