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N. CREATE MEM.SAV
This option
allows you to create a file on diskette called
MEM.SAV into which the contents of
lower user
memory
are
saved whenever you call
~
OS.
When you type
DOS
[
Retlrn
].
the
computer saves
the
contents of lower
user
memory,
including the
RAM-resident user program
(if
any), in
the MEM
.SAV
file before
it
brings the diskette
file
DUP.SYS
into
RAM
.
When you
have
fin-
ished using the DOS options
,
you simply return control to
the
cartridge by typing
8
[ReWTl ],
and MEM.SAV will automatically
reload the portion
of
your program that was
replaced
by
OUP.SVS into RAM. If you are not using a
cartridge,
typing
B
has
no effect
.
You will have to respond to the SELECT
ITEM
OR
[
R6tl.rn
)
FOR MENU
prompt.
You must
be
careful not to allow
DOS
to use all of user memory
when you want the
COPY
FILE
,
DUPLICATE
FILE
,
or DUPLI-
CATE DISK options for saving the existing
data.
DOS
does not
know if all or only
part
of your program
has
been saved in
MEM .SAV. When DOS
utilizes
all of user
memory,
it automati-
cally
invalidates the MEM.SAV file. If this occurs
,
your program
will not be reloaded when control
is
returned to the cartridge
.
Here
are
the
steps for creating a
MEM
.SAV
file on a diskette
inserted
in Drive
1. Note that MEM.SAV files
can only by created
on a diskette
in
Drive 1.
SELECT
ITEt-l OR [""""
I
FOR 1·[EI1'-'
t~
[
~u.m
l
TYPE "Y" TO CREATE MEM.SAU
'y'
I
Aeu.m
J
If you attempt
to
use this option to create a
MEM.SAV file
on a
diskette that already
has
a
MEM
.SAV
file
,
the screen
will
display
[he
message MEM .SAV FILE ALREADY
EXISTS and follow
i[
with the
prompt
SE
LECT ITE
M
OR
[
Aeu.m
J
FOR
MENU.
Why Have a MEM .SAV File?
This
special
file allows you to save your
RAM·resident
program
temporarily
in
a special
file
on
diskette.
To be effective,
MEM.SAV
(which requires 45
sectors)
must
be on
the
diskette
55
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