$E5B4/58804:   Get Character From Keyboard Buffer

Jump from $E5E7, $F147:

E5B4: AC 77 02  LDY $0277     ; Keyboard Buffer Queue (FIFO)
E5B7: A2 00     LDX #$00

Jump from $E5C2:

E5B9: BD 78 02  LDA $0278,X   ; Keyboard Buffer Queue (FIFO)
E5BC: 9D 77 02  STA $0277,X   ; Keyboard Buffer Queue (FIFO)
E5BF: E8        INX
E5C0: E4 C6     CPX $C6       ; Number of Characters in Keyboard Buffer queue
E5C2: D0 F5     BNE $E5B9
E5C4: C6 C6     DEC $C6       ; Number of Characters in Keyboard Buffer queue
E5C6: 98        TYA
E5C7: 58        CLI
E5C8: 18        CLC
E5C9: 60        RTS

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