Echo = $FFEF
Monitor = $FF1F

  LDA $00
  LDY $01

next  
  CPY #$00           ;  Compare counter to 0.
  BEQ done          ;  If we've reached 0, we're done.
  DEY               ;  Decrement the counter
  CLC               ;  Clear carry before ADC
  ADC $00           ;  Add x, n times
  JMP next          ;  Repeast loop

done:  
  STA $03
  STY $02
  JMP Monitor
  
