Editing IBM Model F (section)

===IBM EMR Keyboard===
The EMR keyboard appears to have been used in specialized TEMPEST-hardened versions of IBM PCs designed to block electromagnetic signals that could be illicitly monitored. It appears to be a standard PC/XT Model F with a different cable and connector, and with shielding around the controller card inside the keyboard. Examples have been seen with Caps Lock located to the left of A, Ctrl located to the left of the spacebar, and Alt to the right of the spacebar. Known examples were for PC/XT-style systems, but there may have been some variants of the 122-key terminal, AT, and Model M Enhanced Keyboards with similar cable/connector modifications. The EMR keyboard used a DIN connector with a shield cable, and the EMR II keyboard used a 4-pin D-SUB connector. 

<gallery widths=250px caption="IBM EMR II">
File:EMR1.jpg|IBM EMR Keyboard
File:modfemr.jpeg|The EMR II Keyboard, part number '''100A536'''
</gallery>