$E84B/59467:   Generate checksum

Jump from $E7E1, $E7E9, $E7FF, $E809:

E84B: 18        CLC
E84C: 65 87     ADC $87
E84E: 69 00     ADC #$00
E850: 85 87     STA $87
E852: 60        RTS

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