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Introduction
1-9. Reentrant Code and Private Data
Within the MPE environment, many user and system functions can be
active concurently
without interferring with each
other because
the hardware
provides protection of programs and
guarantees the
privacy
of user data
areas.
The hardware
keeps code
and data
physically separate
by organizing them into
reentrant code seg-
ments and data segments.
(The code segments can be
shared among
users, but not altered.
The data segments cannot be shared, but
can be
altered by the creating user.)
This segmenting
ability
facilitates
the operation of virtual memory in that 1; code seg-
ments need
ne ve r be swapped out since an
ident ical cop y
always
exists on disc,
and 2;
code segments can be swapped
indirectly
from wherever the
program file resides on disc without having to
be copied first to a special swapping disc.
1-1J.
~erating
System
A single,
comprehensive operating
system
(MPE)
supervises the
processing
of all
user programs and
provides the user
with an
extensive set of system functions. The major features of MPE are:
a.
Interchangeable batch and interactive processing
b.
Uniform,
device-independent,
and language-independent
file
system
c.
File coordination and security
d.
Input and output spooling (concurrent usuage of I/O devices)
e.
Console job contr
01
f.
Automatic scheduling
management)
(under control
of
the
installation's
g.
System back-up facility
h.
Power fail/auto restart
i.
System tailoring (under control of installation's management)
j.
System logging facility
1-11. HARDWARE FEATURES
The hardware design of the HP 3000
Series
III
Computer
System
will be discussed in detail throughout the remainder of this man-
ual.
Briefly, the hardware features are:
a.
Up to 1024K words of high-speed,
fault correcting,
semicon-
ductor memory
b.
High-speed selector channels for block transfers between main
memory and high-speed I/O devices such as discs
1-3
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Troubleshooting
