$D4DA/54490:   Close internal channel

D4DA: A9 11     LDA #$11
D4DC: 85 83     STA $83
D4DE: 20 27 D2  JSR $D227
D4E1: A9 12     LDA #$12
D4E3: 85 83     STA $83
D4E5: 4C 27 D2  JMP $D227

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