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Wang 725-7231-US
Manufacturer	Wang
Switch	Alps SKCM Black (Bamboo)
Protocol	DB-9 Unknown Protocol
Years of Production	Unknown - 1997

The Wang 725-7231-US is a modified version of the Wang 725-3770 keyboard. It was likely part of the United States National Security Agency (NSA) Tempest Program. Several other Tempest modified versions of keyboards have been spotted, including the Zenith Z-150, Apple M0115, several IBM Model F keyboards, and even another Wang. Tempest keyboards have enhanced electromagnetic shielding to prevent spying, and were used in sensitive applications within the United States government. While superficially similar to the standard Wang 725-3770, this keyboard has a metal plate over the top of the switches along with keycap risers, a shielded DB-9 connector, and a unique PCB that does not appear to have been made by Alps Electric.