Logic circuit for selecting signals indicative of operating states of floppy disk apparatus

摘要

A logic signal selection setting apparatus for facilitating verification and change of set states of various logic signal selection modes in a floppy disk apparatus comprises a memory of which data can be rewritten at a given time, a signal generating circuit for generating a signal for reading at a predetermined time the data written in the memory at the given time, and a shift register supplied at an input with the data read out from the memory at the time generated by the read signal generating circuit to thereby set up a signal selection mode for selecting an interface output signal of a logic circuit or a signal for lighting a light emission element for displaying the in-service state of the apparatus. The data stored in the memory is read out at the time generated by the memory read signal generating circuit to be input to the shift register thereby to allow the shift register to set the selection signal for the selector circuit to select the interface output signal or an LED lighting signal indicating the in-service state of the floppy disk apparatus.