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Preface
This publication provides, for reference purposes, a
detailed definition of the architecture of IBM 4300
Processors when operating in the Extended Control
Program Support: Virtual Storage Extended
(ECPS:VSE) mode.
The publication describes each function of the
architecture to the level of detail that must be
understood in order to prepare an
assembler-language program that relies on that
function.
It
does not, however, describe the
notation and conventions that must be employed in
preparing such a program.
The information in this publication is provided
principally for use by assembler-language
programmers, although anyone concerned with the
functional details of the IBM 4300 Processors will
find it useful.
This publication is written as a reference
document and should not be considered an
introduction or a textbook.
All facilities discussed in this publication are not
necessarily available on every processor. Further-
more, in some instances the definitions have been
structured to allow for some degree of extensibility,
and therefore certain capabilities may be described
or implied that are not offered on any model. An
example of such capabilities is the provision for the
number of channel-mask bits in the control register.
The allowance for this type of extensibility should
not be construed as implying any intention by IBM
to provide such capabilities. For information about
the characteristics and availability of features on a
specific processor, use the functional characteristics
manual for that processor. The availability of
features on processors is summarized in the IBM
4300 Processors Summary and Input/Output
&
Data Communications Equipment Configurator,
GA33-1523.
This publication applies only to the ECPS: VSE
mode of operation. The IBM System/3 70
Principles of Operation, GA22-7000, should be
consulted regarding the functions of the
architecture which applies when the processor
operates in the System/370 mode.
Size
Notation
The letters K and M denote the multipliers 2
10
and
2 20 , respectively. Although the letters are
borrowed from the decimal system and stand for
kilo (10
3 )
and mega (10
6 ),
they do not have the
decimal meaning but instead represent the power of
2 closest to the corresponding power of 10. Their
meaning in this publication is as follows:
Symbol
Value
K (k i 10)
1,024
=
2 10
M
(mega)
1,048,576
=
220
The following are some examples of the use of K
andM:
2,048 is expressed as 2K.
4,096 is expressed as 4K.
65,536 is expressed as 64K (not 65K).
224 is expressed as 16M.
When the words "thousand" and "million" are
used, no special power-of-2 meaning is assigned to
them.
iii
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