Field Engineering Theory of Operation
Provided by the ASK Keyboard Dictionary
A Field Engineering Theory of Operation manual was a type of official document that could be available for a given computer, keypunch typewriter or terminal. FETOMs were prominent for IBM systems up to and including the 1980s. They were intended for technicians working externally to IBM and described how such systems (including their keyboards and keyboard assemblies) operated, thus a useful source for information.
