$F713/63251:   Output I/O Error Messages: 'ILLEGAL DEVICE NUMBER'

Jump from $F390, $F4AF, $F536, $F53E, $F5F1, $F65C:

F713: A9 09     LDA #$09
F715: 48        PHA
F716: 20 CC FF  JSR $FFCC     ; Restore I/O Vector
F719: A0 00     LDY #$00
F71B: 24 9D     BIT $9D       ; Error-Mode-Flag
F71D: 50 0A     BVC $F729
F71F: 20 2F F1  JSR $F12F     ; Print Message
F722: 68        PLA
F723: 48        PHA
F724: 09 30     ORA #$30
F726: 20 D2 FF  JSR $FFD2     ; Output Vector, chrout

Jump from $F71D:

F729: 68        PLA
F72A: 38        SEC
F72B: 60        RTS

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