$CC1B/52251:   Perform [B] - Block/Buffer command

CC1B: A0 00     LDY #$00
CC1D: A2 00     LDX #$00
CC1F: A9 2D     LDA #$2D
CC21: 20 68 C2  JSR $C268
CC24: D0 0A     BNE $CC30
CC26: A9 31     LDA #$31
CC28: 4C C8 C1  JMP $C1C8
CC2B: A9 30     LDA #$30
CC2D: 4C C8 C1  JMP $C1C8
CC30: 8A        TXA
CC31: D0 F8     BNE $CC2B
CC33: A2 05     LDX #$05
CC35: B9 00 02  LDA $0200,Y
CC38: DD 5D CC  CMP $CC5D,X
CC3B: F0 05     BEQ $CC42
CC3D: CA        DEX
CC3E: 10 F8     BPL $CC38
CC40: 30 E4     BMI $CC26
CC42: 8A        TXA
CC43: 09 80     ORA #$80
CC45: 8D 2A 02  STA $022A
CC48: 20 6F CC  JSR $CC6F
CC4B: AD 2A 02  LDA $022A
CC4E: 0A        ASL
CC4F: AA        TAX
CC50: BD 64 CC  LDA $CC64,X
CC53: 85 70     STA $70
CC55: BD 63 CC  LDA $CC63,X
CC58: 85 6F     STA $6F
CC5A: 6C 6F 00  JMP ($006F)

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