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- W133037778 abstract "This chapter describes the IBM System/38. IBM's capability-based System/38, announced in 1978 and delivered in 1980, is an outgrowth of work that began in the late 60s and early 70s on IBM's future system project. A major goal of the System/38 design is to maintain programmer independence from the system implementation; IBM wished to retain maximum flexibility to modify System/38's implementation for future technologies while supporting previously written System/38 programs. The System/38's high-level architecture interface is actually an intermediate language produced by all System/38 compilers. Before a program is executed, CPF translates this intermediate language into vertical microcode and calls to vertical microcode procedures. That is, the high-level interface is not directly executed. System/38 instructions operate on two types of entities—scalar data elements and system objects. The scalar types are 16-and 32-bit signed binary, zoned and packed decimal, and character strings. The machine supports 14 types of system objects. A set of type-specific instructions is provided for each system type. Each system object consists of two parts—a functional portion and an optional space portion. The functional portion of an object is a segment containing object state; the data in the functional portion can be examined and modified only by microcode as a result of type-specific instructions. Thus, the functional portion is said to be encapsulated because it is not accessible to programs." @default.
- W133037778 created "2016-06-24" @default.
- W133037778 creator A5069107397 @default.
- W133037778 date "1984-01-01" @default.
- W133037778 modified "2023-10-05" @default.
- W133037778 title "The IBM System/38" @default.
- W133037778 doi "https://doi.org/10.1016/b978-0-932376-22-0.50013-2" @default.
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