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IBM 5100 Apl Reference Manual

IBM 5100
228 pages
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(
(~i
Notes:
1.
The
ATTN key
is
not
operative during
the
)MARK
command
operation.
2.
If
the
message
ALREADY
MARKED
is
displayed
after
a )MARK
command
was issued,
the
specified file already exists
on
the
tape.
To
re-mark
the
specified file,
enter
GO.
If
the
file
is
not
to
be re-marked, press EXECUTE
to
continue.
CAUTION
If
an existing file
on
tape
is
re-marked,
the
original
information
in
the
re-marked
file and
the
existing files following
the
re-marked file
cannot
be
used again.
Syntax
)MARK size
number
of
files
to
mark starting file
number
[device]
where:
size
is
an integer specifying
the
size
of
each file in
1024-byte
(1K) blocks
of
storage.
The
following
formulas
can be used
to
determine
what
size a file
should
be
marked.
The
formula
for
a workspace file (the
contents
of
the
active
wo~kspace
written
to
tape
with a )SAVE
or
)CONTINUE
command)
is
MAXSIZE= 3+f (CLEAR-ACTIVE)-;-1024, where:
• MAXSIZE
is
the
maximum
amount
of
tape
storage
(number
of
1024-byte
blocks)
that
would be required
to
write
the
contents
of
the
active
workspace
to
tape.
• CLEAR
is
the
value
of
DWA (see
Chapter
5)
in
a clear workspace.
• ACTIVE
is
th~
value
of
DWA
just
before
the
contents
of
the
active
workspace
are
written
to
tape.
The
formula
for
a
data
file (data
written
to
tape
using an APL shared variable
-see
Chapter
8) when all
of
the
data
is
contained
in
the
active workspace
is
MAXSIZE= r
(WI!HOUT
-WITHH-1
024,
where:
• MAXSIZE
is
the
maximum
amount
of
tape
storage
(number
of
1024-byte
blocks) required
to
write
the
data
to
tape.
• WITH
is
the
value
of
DWA (see
Chapter
5) with
the
data
in
the
active work-
space.
• WITHOUT
is
the
value
of
DWA
before
any
data
to
be
written
to
tape
was
stored
in
the
active workspace.
There
is
no
formula
for
determining
what
size
to
mark a
data
file
when
the
data
is
written
to
tape
as it
is
entered
from
the
keyboard.
The
amount
of
tape
storage
required
depends
upon
how
much
data
is
entered
from
the
keyboard
and
what
type
of
data
is
used.
For
information
on
how
many
bytes
of
storage
are
required
by
the
various
types
of
data,
see Storage Considerations in
Chapter
9.
Note:
The
file
header
for
each
marked
file requires
0.5K
bytes
of
storage. There-
fore,
the
number
of
bytes
of
tape
storage required
for
each file
is
the
specified size
of
the
file plus
0.5K.
19

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IBM 5100 Specifications

General IconGeneral
Release Year1975
RAM16 KB - 64 KB
Storage204 KB tape drive
Display5-inch CRT
Operating SystemAPL/BASIC
ProcessorIBM PALM (1.9 MHz)

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