$9B/155:   Parity of Byte Output to Tape

  Used by Jiffy-DOS: KEYBYT

   Used only from Basic for Jiffy-DOS wedge comands, device
   toggle and function keys.

Kernal-Reference:

 EOR $9B     : $F9F8 $FC05
 LDA $9B     : $F9CE $FC4E
 STA $9B     : $F9FA $FBA1 $FC07

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