IBM 33L4767

"BF-400B(1.1)" is silkscreened on the board.
 * "MADE IN TAIWAN" is underneath the silkscreened text.
 * This device is presumed to be a Bafo (Taiwan First Line Electronics Corp) BF-400B. The LED locations and functions match up with the BF-400 on the old Bafo website.

Noted as an accessory for the NetVista 6644, 6645, and 6646 models
 * Presumed ~2000 release year