$EDCC/60876:   Wait For Clock

Jump from $F23F:

EDCC: 78        SEI
EDCD: 20 A0 EE  JSR $EEA0     ; Serial Output 0
EDD0: 20 BE ED  JSR $EDBE     ; Clear ATN
EDD3: 20 85 EE  JSR $EE85     ; Serial Clock On

Jump from $EDD9:

EDD6: 20 A9 EE  JSR $EEA9     ; Get Serial Data And Clock In
EDD9: 30 FB     BMI $EDD6
EDDB: 58        CLI
EDDC: 60        RTS

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