Printer port signal return device on IBM compatible computers

摘要

This is a convenient device because it is used in IBM compatible computers and it is easy to check the integrity of the interface port, which is very inconvenient and uncertain.;It uses diode FR107 OR gate to convert 8 parallel data signals into serial data signal format and LOOP BACK (recovers) so that all the output signals are looped back to the 5 input terminals of the printer port We have made it possible to inspect.;It is used when the computer room or computer service engineer of the enterprise is not able to know whether the computer is defective or the printer is defective. Especially, it is easy to judge whether it is defective when only one computer printer is used.;In addition, it is used to check whether the person who is involved in the computer affects whether or not the computer is bad when the computer suddenly fails to print while using the computer.