$DF21/57121:   Write side-sector

DF21: 85 F9     STA $F9
DF23: A9 90     LDA #$90
DF25: 48        PHA
DF26: B5 EC     LDA $EC,X
DF28: 29 01     AND #$01
DF2A: 85 7F     STA $7F
DF2C: 68        PLA
DF2D: 05 7F     ORA $7F
DF2F: 8D 4D 02  STA $024D
DF32: B1 94     LDA ($94),Y
DF34: 85 80     STA $80
DF36: C8        INY
DF37: B1 94     LDA ($94),Y
DF39: 85 81     STA $81
DF3B: A5 F9     LDA $F9
DF3D: 20 D3 D6  JSR $D6D3
DF40: A6 F9     LDX $F9
DF42: 4C 93 D5  JMP $D593

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