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Preface



The IBM System/38 employs both advanced tech-
nology and many new data processing concepts.
While the laboratory in Rochester, Minnesota, had
primary responsibility for design and development,
IBM people in laboratories in Boeblingen, Germany,
Burlington, Vermont, and East Fishkill, New York,
made important contributions.

Our mutual objective was to produce a system that
would be both accessible and extendable, and at the
same time offer efficient conversion facilities.

Function menus, help keys, multilayer messages, and
a system-wide control language are essential elements
of System/38, along with a flexible "user authoriza-
tion" scheme for system integrity and security. We
chose to avoid traditional hardware-dependent
addressing and storage management and instead to
readily accommodate new technologies and storage
organizations through a high-level machine archi-
tecture that not only frees the user from earlier
restrictions but also supports a new kind of data
base facility.

Finally, because System/38 is viewed as a growth
path from present systems, especially the IBM
System/3, we developed conversion techniques rather
than an emulator to give these users an opportunity The papers in this volume are not intended to replace IBM
to benefit from the novel, even unique, capabilities of publications in describing the capabilities of the system
components and how to use them. Keep in mind that the
the System/38. papers are for general technical communication purposes;
they do not represent an IBM warranty or commitment to
Some 50 authors are represented in this special specific capabilities in the referenced products.
collection of papers. I want to thank them and their Different structures and levels of detail may exist in the
many colleagues whose combined efforts made papers because they were written as technical articles by
System/38 a distinguished family of IBM products. various developers of the System/38. In order to preserve
their technical integrity and vitality, they have not been
integrated relative to consistency of style, language, or
method of presentation.
B. G. Utley Note that these papers will not be updated as changes are
Manager, GSD Advanced Systems December 1978 made over time to the System/38 products.
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IBM S/38 TECH DEV, pp. 1-110, 1978




Table of contents



G. G. Henry 3 Introduction to IBM System/38 architecture


ENGINEERING TECHNOLOGY SUPPORT
N. C. Berglund 7 Processor development in the LSI environment

H. W. Curtis 11 Integrated circuit design, production, and packaging for System/38
M. N. Donofrio, B. Flur, and R. T. Schnadt 16 Memory design/technology for System/38


UNDERLYING MACHINE STRUCTURE
R. L. Hoffman and F. G. Soltis 19 Hardware organization of the System/38

M. E. Houdek and G. R. Mitchell 22 Translating a large virtual address

D. O. Lewis, J. W. Reed, and T. S. Robinson 25 System/38 I/O structure

E. F. Dumstorff 28 Application of a microprocessor for I/O control

F. X. Roellinger, Jr. and D. J. Horn 32 Microprocessor-based communications subsystem

J. N. Tietjen and W. E. Hammer 36 Microprocessor-based work station controller

D. T. Brunsvold 38 Microprocessor control of impact line printers for printing character-string data

J. W. Froemke, N. N. Heise, and J. J. Pertzborn 41 System/38 magnetic media controller

R. A. Peterson 44 Shared function controller design