The DS-640 is a 2-Way Centronics 50 pins Manual Switchbox is a convenient way to share parallel printers among multiple computers used mainly for parallel interface between older computers and other devices using standard I/O interface by IEEE 1284 method. This method was the standard interface for connecting printers and other parallel devices for specifing the modes of operation to provide data transfer in either direction (computer to peripheral, peripheral to computer), or bi-directional (one direction at a time). Some of these older devices are scanners, tape drives, hard disks that use SCSI, and printers.
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