$FEF3/65267:   Delay loop for serial bus in 1541 mode, from $E97D

Jump from $E97D:

FEF3: 8A        TXA
FEF4: A2 05     LDX #$05

Jump from $FEF7:

FEF6: CA        DEX             ; about 40 microseconds
FEF7: D0 FD     BNE $FEF6
FEF9: AA        TAX
FEFA: 60        RTS

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