IBM 3115/3125 Operator Console Keyboard
Provided by the ASK Keyboard Directory
IBM-made 66-key operator console keyboard for the IBM System/370 Models 115 and 125 mainframe computers' 3115 and 3125 (respectively) Operator Consoles. It was partially integrated to the base of the console's CRT display. The keyboard notably had a green "START" key and a red "STOP" key, and an Operator Control Panel (OCP) with buttons for powering the host system on and off, performing low-level was detected, and an emergency pull to cut power to the host system immediately. There were two versions of 3115/3125 keyboard, and this was the original one with relatively thick side bezels.
