$79/121:  LED-Flag

  b5: LED-Blinken
  b6: Drive LED an

ROM-Reference:

 AND $79    : $CE2B
 LDA $79    : $81EA $81F6 $9569 $957D $B128 $B131 $B143 $B14B $C546 $C54F
              $C558 $C561 $CE11 $CE27
 STA $79    : $81EE $81FA $956D $9581 $B12C $B135 $B147 $B14F $C54A $C553
              $C55C $C565

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