     $FD50/64848:   Initialise System Constants

    Jump from $FCF5, $FF87:

    FD50: A9 00     LDA #$00
    FD52: A8        TAY

    Jump from $FD5D:

    FD53: 99 02 00  STA $0002,Y
    FD56: 99 00 02  STA $0200,Y
    FD59: 99 00 03  STA $0300,Y
    FD5C: C8        INY
    FD5D: D0 F4     BNE $FD53
    FD5F: A2 3C     LDX #$3C
    FD61: A0 03     LDY #$03
    FD63: 86 B2     STX $B2
    FD65: 84 B3     STY $B3
    FD67: A8        TAY
    FD68: A9 03     LDA #$03
    FD6A: 85 C2     STA $C2

    Jump from $FD86:

    FD6C: E6 C2     INC $C2

    Jump from $FD84:

    FD6E: B1 C1     LDA ($C1),Y
    FD70: AA        TAX
    FD71: A9 55     LDA #$55
    FD73: 91 C1     STA ($C1),Y
    FD75: D1 C1     CMP ($C1),Y
    FD77: D0 0F     BNE $FD88
    FD79: 2A        ROL
    FD7A: 91 C1     STA ($C1),Y
    FD7C: D1 C1     CMP ($C1),Y
    FD7E: D0 08     BNE $FD88
    FD80: 8A        TXA
    FD81: 91 C1     STA ($C1),Y
    FD83: C8        INY
    FD84: D0 E8     BNE $FD6E
    FD86: F0 E4     BEQ $FD6C

    Jump from $FD77, $FD7E:

    FD88: 98        TYA
    FD89: AA        TAX
    FD8A: A4 C2     LDY $C2
    FD8C: 18        CLC
    FD8D: 20 2D FE  JSR $FE2D
    FD90: A9 08     LDA #$08
    FD92: 8D 82 02  STA $0282
    FD95: A9 04     LDA #$04
    FD97: 8D 88 02  STA $0288
    FD9A: 60        RTS

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    Kernal-Reference:

     LDA $FD93,X : $FCBD

     LDA $FD94,X : $FCC3