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The structured assembly language for the GeneralElectric Company 4xxx range of computers and their OS4000operating system. It is strictly an assembler in that thegenerated code is relatively predictable but it can be writtenin a sufficiently structured manner, with indentation, controlstatements, function and procedure calls, to make theresultant source easy to read and manage. Even with thisvisible structure however, it is important to remember thatthe assembly of the statement is done left to right.The British videotext system, Prestel is programmed inBabbage.[Datamation, 1980s].