$F220/61984:   Verify number of free blocks in BAM

F220: A5 6F     LDA $6F
F222: 48        PHA
F223: A9 00     LDA #$00
F225: 85 6F     STA $6F
F227: AC 86 FE  LDY $FE86
F22A: 88        DEY
F22B: A2 07     LDX #$07
F22D: B1 6D     LDA ($6D),Y
F22F: 3D E9 EF  AND $EFE9,X
F232: F0 02     BEQ $F236
F234: E6 6F     INC $6F
F236: CA        DEX
F237: 10 F4     BPL $F22D
F239: 88        DEY
F23A: D0 EF     BNE $F22B
F23C: B1 6D     LDA ($6D),Y
F23E: C5 6F     CMP $6F
F240: D0 04     BNE $F246
F242: 68        PLA
F243: 85 6F     STA $6F
F245: 60        RTS
F246: A9 71     LDA #$71
F248: 20 45 E6  JSR $E645

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