IBM-3-89 keyboard (Jeong Nae-kwon, 「Hangul Input Method Hong Du-kee」, 「Micro Software」

"When the 3-89 keyboard was distributed through the Hangul Cultural Center, the official name was the IBM-3-89 keyboard. The 3-89 keyboard was used in the DOS environment of an IBM compatible PC and other Hangul support programs. Originally, it was a keyboard layout aimed at spreading it to IBM-compatible PCs, but it had the characteristics of an integrated three-beol-type keyboard that could be used in a typewriter or Macintosh environment. This is because direct Hangul processing was possible by equipping all the layers used in Korean these days. So the 3-89 keyboard could also be called IBM-3-89 unification."— Translation of https://pat.im/962