$DF4C/57164:   Calculate number of blocks in a REL file

DF4C: A9 78     LDA #$78
DF4E: 20 5C DF  JSR $DF5C
DF51: CA        DEX
DF52: 10 F8     BPL $DF4C
DF54: A5 72     LDA $72
DF56: 4A        LSR
DF57: 20 5C DF  JSR $DF5C
DF5A: A5 73     LDA $73
DF5C: 18        CLC
DF5D: 65 70     ADC $70
DF5F: 85 70     STA $70
DF61: 90 02     BCC $DF65
DF63: E6 71     INC $71
DF65: 60        RTS

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