     $F969/63849:   Error entry disk controller

    Jump from $F2D5, $F390, $F40D, $F420, $F4F8, $F507, $F553, $F583, $F6C7,
              $FDA0, $FDE2:

    F969: A4 3F     LDY $3F
    F96B: 99 00 00  STA $00,Y
    F96E: A5 50     LDA $50
    F970: F0 03     BEQ $F975
    F972: 20 F2 F5  JSR $F5F2

    Jump from $F970:

    F975: 20 8F F9  JSR $F98F
    F978: A6 49     LDX $49         ; get stack pointer back
    F97A: 9A        TXS
    F97B: 4C BE F2  JMP $F2BE

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