$F969/63849:   Error entry disk controller

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

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