$DDAB/56747:   Verify command code for writing

Jump from $CF4C, $E052, $E060:

DDAB: 20 93 DF  JSR $DF93       ; get buffer number
DDAE: AA        TAX
DDAF: BD 5B 02  LDA $025B,X
DDB2: 29 F0     AND #$F0        ; isolate command code
DDB4: C9 90     CMP #$90        ; code for writing?
DDB6: 60        RTS

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