01c55c:  jsl  $008674   [008674]   A:f3a9 X:0009 Y:0074 S:01e8 D:0000 DB:01 NVMXdizc V: 16 H: 482



008674:  sty  $03       [000003]   A:  a9 X:  09 Y:  74
008676:  ply                       A:  a9 X:  09 Y:  74 [$0000]: 000000
008677:  sty  $00       [000000]   A:  a9 X:  09 Y:  5f [$0000]: 000000
008679:  rep  #$30                 A:  a9 X:  09 Y:  5f [$0000]: 00005F
00867b:  and  #$00ff               A:??a9 X:??09 Y:??5f [$0000]: 00005F
00867e:  asl  a                    A:00a9 X:??09 Y:??5f [$0000]: 00005F
00867f:  tay                       A:0152 X:??09 Y:??5f [$0000]: 00005F
008680:  pla                       A:0152 X:??09 Y:0152 [$0000]: 00005F
008681:  sta  $01       [000001]   A:01c5 X:??09 Y:0152 [$0000]: 00005F
008683:  iny                       A:01c5 X:??09 Y:0152 [$0000]: 01c55F
008684:  lda  [$00],y   [01c6b2]   A:01c5 X:??09 Y:0153 [$0000]: 01c55F---
008686:  sta  $00       [000000]   A:4a13 X:??09 Y:0153 [$0000]: 01c55F---
008688:  sep  #$30                 A:4a13 X:??09 Y:0153 [$0000]: 014a13
00868a:  ldy  $03       [000003]   A:  13 X:  09 Y:  53 [$0000]: 014a13
00868c:  jmp  [$0000]   [000000]   A:  13 X:  09 Y:  74 [$0000]: 014a13


014a13:


My only working theory is that it references the 4A and 13 from ROM here:
CODE_01C6A5:        A5 13*         LDA RAM_FrameCounter      ;  |
CODE_01C6A7:        4A*            LSR                       ;  |