VECTOR GRAPHIC, INC.
Valid FRe Extensions Under
Vector
4 CP/M
These
are
some of the more
common
extensions
you
might
see
in a directory:
EXTENSION DESIGNATION
ASM
Assembly language source code for program file
PRN Printer listing for program file
HEX
Hexadecimal (machine) code, ready
to
LOAD
BAS
BASIC
language program file
$$$ Temporary
file
(used by
the
operating system while copying
files)
BAK
Backup file (used in most text-editing programs)
COM
Command
file (see below)
Other
than
these,
you
can
give a non-program file any extension
you
want
(any combination of three
characters).
The
extensions
listed
above
have
a
specific
meaning
to
the
operating
system,
though, and should not be used
except where appropriate.
Un
addition, there
may
be
other
specific extensions
used
by
programs which you may
obtain
or
use
in
the
future.)
For
the
remainder of this manual, the Command (.COM)
file
will
be
mentioned most
frequently.
Command
FUes
Recall
that
"transient commands" and "applications programs"
are
loaded by the
Console Command
Processor into the Transient Program Area
before
they
can
be
run.
Program
tiles
for
Vector
4 CP/M
are
stored
on disk
in
what
are
called
!'command
files".
These
are
displayed
in
the
directory
with
the
extension
.COM. All Command
Files
are
used in much the same way, since
they
are
all
created
in
much
the same way.
Briefly, a
Command
file
starts
its
career
as an
.ASM
file, in a code
that
looks
a
little
bit
(but not
much)
like English: assembly programming language. Once
the
program is
ready
to
be
run,
it
is converted
to
machine code (the
actual
numeric instructions
that
the microprocessor acts on) by
two
other
programs,
ZSM.COM
and LOAD.COM. Only then is the
.COM
file ready to be used
by
the Console
Command
Processor.
To
use
a command file, you need only enter the file name, plus any command
line which the file requires for input.
Most
transient commands,
for
example,
use optional command lines which
may
save
you
time and
effort.
For instance,
the
PIP command (which you will probably be using a
great
deal) allows you
to
make a copy
of
one
file
in
another area, another disk drive, or with another
name.
VII-26
7100-0001
9-01-82 - Rev. A
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