[Coco] Was reading HDB-DOS code to relax

[Robert Gault]

Juan Castro wrote:
> 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
>

Juan,

Looks like it should work and be faster.

  bita #1   2cyc
  beq LC0C2 3cyc
  inca      2cyc
LC0C2

5 cycles if even, 7 cycles if odd

  inca      2cyc
  anda #$FE 2cyc
LC0C2
4 cycles either even or odd