I/O Switch The serial bus I/O SwitchBox. It is used to selectwhich computer has access to which drives, and which printer.The shorter serial cables are for drives. The longer serial cable is for a computer.The red/black wire is the 12V supply line.
I/O Switch The rotary switches select the drives; device 8, and 9. The red toggle switch selects which computer has accessto the drives. The left hand, white toggle engages or disengages the reset line. With the reset line toggled out, I can reset the computer without disturbing the drives.Then I can read the error channel from the drive. The right hand white toggle selects between two printers.
I/O Switch A view of the rear. Here the two printersattach, as well as the second computer.