P/N 100A535
Type
Model F/XT TEMPEST EM-Dampened Keyboard
OEM
IBM
Switches
IBM capacitive buckling springs
Earliest Appearance
1987
Key Count
83
Original Keycaps
PBT with dye-sublimated legends
Casing Colour
White
Branding
IBM silver square badge
Feet
Single-setting Model F-style riser feet
Connection
Set 1/XT over DE-9 (4P)
Layout/Language
XT
More about this type of keyboard...
The IBM EMR and EMR II Keyboards were the final variant of the Model F/XT, featuring different cables and connectors and shielding around the internal logic board. These keyboards were designed to be compliant with the shielding specification of codename TEMPEST, a NATO-recognised U.S. National Security Agency specification regarding methods of spying and protecting against spying with electronic equipment. In particular, these keyboards were designed to not radiate electromagnetic emanations to counter Van Eck phreaking.