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CONTINUOUS MEMORY
Programs that you write and record in the PMS remain there until you purpose-
ly
remove
them.
The continuous memory of the PMS saves the programs, even
after operating power is removed.
The battery, which provides the continuous
memory,
is
wired
into the PMS.
Although it is not rechargeable, it should
give you several years of carefree use.
Note: The PMS simulates a
ROM
and
will
retain
its
memory
for
long periods of
time.
It should be remembered,
however,
that the contents of the PMS will be lost
before you receive the first warning that
the
battery is no longer maintaining the
memory.
It is advisable to back up
your
programs
frequently
on
a
secondary
storage medium, such as a mag card, or in
the HP-75 itself •
If you turn on the PMS and an error
232--INVALID
ately appears in the HP-75 display, the battery is
and should be replaced. (Refer to appendix B.) All
in the PMS is lost.
CHECKSUM
message
immedi-
not maintaining the memory
material previously stored
PERMANENT PLUG-IN MODULES
Hewlett-Packard will convert the programs you have developed
and
stored
in
your PMS into permanent plug-in modules, should you so desire.
A ROM ID number must be provided at initialization of a PMS bank to
identify
the
unit. (Refer
to the BUILD command, page 12.) If you intend to have your
programs converted into permanent plug-in modules, you should
first
contact
Hewlett-Packard and obtain permanent ID numbers for your exclusive use.
GENERAL OPERATING PROCEDURE
The simple operating procedure for the PMS is outlined below.
The
commands
are described in detail later.
(Throughout the rest of this manual, the word
"program" will be used in the singular.
It should
be
understood,
however,
that
multiple
programs
may be used so long as they do not exceed available
space limitations.)
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