$DDAB/56747:   Verify command code for writing

DDAB: 20 93 DF  JSR $DF93
DDAE: AA        TAX
DDAF: BD 5B 02  LDA $025B,X
DDB2: 29 F0     AND #$F0
DDB4: C9 90     CMP #$90
DDB6: 60        RTS

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