The structured assembly language for the [[Computer Dictionary/General Electric Company|General Electric Company]] 4xxx range of computers and their OS4000 [[Computer Dictionary/operating system|operating system]]. It is strictly an assembler in that the generated code is relatively predictable but it can be written in a sufficiently structured manner, with indentation, control statements, function and procedure calls, to make the resultant source easy to read and manage. Even with this visible structure however, it is important to remember that the assembly of the statement is done left to right.
[1980's article in Datamation].
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