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Chapter
11
LINKING OBJECT MODULES
MS®-LINK is
an
MS-DOS
utility
program designed to produce
ready-to-run machine language code.
You
should read
all
of
this
chapter before you use the linker. Chapter 12 contains technical
information
for
experienced users. LINK error messages
are
in
Part
6.
If
you
are
not going to compile
and
link
programs, you
do
not
need to read
this
section.
Basic
Information
Programs
are
written
in
source code. Passing
the
source code
through
a compiler or
an
assembler produces
an
object module.
This object module, however, cannot be understood by
the
com-
puter
directly.
To
produce machine language code
that
the computer
can
under-
stand, you
must
pass the object module through
the
link
process.
Following
is
a
summary
of
the
linker
requirements
and
functions.
System
Requirements
The
linker
requires
the following:
• At least 50K bytes of memory. 40K bytes
are
for
code
and data;
the
remaining
10K bytes
are
for
run
space.
• One disk drive,
if
output is sent to the same diskette
from
w4ich
input
was taken.
• Two
disk
drives,
if
output
is
sent
to
a
different
diskette.
Because
the
linker
does not allow
time
to swap
diskettes
during
operation on a one-drive configura-
tion,
the
use of two disk drives is more practical.
235
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