This device is NOT part of the Entrex 480 system,
but in order to understand a "Key-To-Disk" system like the Entrex 480,
here is a "Key-To-Tape" stand-alone device to illustrate the differences.
Notice the "029" keyboard layout?
Seeking To Preserve Entrex 180, 280, 380, 480, 580 & Nixdorf 620 Systems & Data/Scope Keystation Terminals