Basic/Expanded arrangement of 3-91 keyboard (Hangul Cultural Center distributed material, 1993.9.4)

"The 3-91 keyboard used on the Macintosh had an extended array with option keys (option keys). However, the arrangement for writing the selection keys is not only for the Hangul keyboard, and it is hardly known because it cannot be used in Windows. In this extended array, symbols such as @, $, ^, & are also missing."— https://pat.im/962