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             GF20-0385-0




Data
Processing   An Introduction to
Techniques   Microprogramming

             This document describes some aspects of microprogram-
             ming as it has been and is being used in certain IBM
             processirig units. It is intended to provide a general
             understanding of the subject.

             To achieve this objective, the document has been divided
             into two parts-Part I provides the reader with elementary
             concepts: what microprogramming is, what it does, how it
             is used, etc. This material is sufficient for the reader who
             wishes only a broad understanding of microprogramming.
             Part I requires ~o prerequisite knowledge by the reader
             other than basic data processing concepts.
             Part II is far more detailed and is intended to provide an
             understanding of some microprogramming specifics.
             While the System/370 Models 135 and 145 are used as
             instructional devices, the material is not intended to be
             a description of how, or through what vehicles, these
             devices are microprogrammed. Part II requires close
             attention to detail, and is for those who wish a more
             explicit description than that provided by Part I. Part II
             presumes some knowledge of assembler language program-
             ming concepts as well as a basic familiarity with the
             principles of complement arithmetic.

             The document concludes with some recommendations for
             further reading. IBM does not provide educational or
             instructional manuals for any specific microprogrammable
             device. However, the field engineering maintenance
             documents peculiar to the device in question, as an adjunct
             to their primary objective, may contain further details on
             certain microprogram mabie aspects of that device.
 CONTENTS
                     Part I

                     OverView . . . . . . . . . . . . . . . .                                                 . . . .            1
                          Simulation of Functions . . . .          ......... .                                . . . . . ..       1
                          Microcode: The IBM System/360 . . . . . . . . . .                                       . . ..         1
                          Read Only Storage . .           ....             . . . .                                     ...       2
                          Writable Control Storage                                                                               2
                          System/370 . . . . .                       . . . . .                                         ...       3
                          Special Features . . .                       . . . . . . . .                                   . . 4
                          Considerations of Reloadable Control Storage .                                                     

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