Advertisement
SYSTEM DESCRIPTION
SWI$UV
IRGSUV
24.5 -- Memory Map
The
add~ess
oT
a
user-defined SWI
handler.
This
vector
must
be
initialized
by
a user
prog~am
iF it
is
using
SWIs
other
than
those
defined
for
MDOS
system functions.
This vector is set to point to an
RTI
instruction
each
time
the
MDOS
command interpreter is given
cont~ol.
The address
or
a
user-aefined
IRG
handle~.
This
vector
must
be
initialized by a
use~
program
iT
it
is using IRGs.
This vector is set to
point to an RTI instruction each time
the MDOS command interpreter is given
control-
This
vector
is
not
availabale with
MDOS09.
24.6
MOOS Command Interpreter
TheMDOS command interpretsi' is one of the MDOS overlays
that
g~ts
control
whenever
MOOS
has
been
initialized
or
whenever
a
command
has
completed
and returned control to
MDOS.
This overlay will.
cause
the
standard
.command
line
input prompt
(=)
to be displayed whenever it is activated.
Once
in
controL
the
interpreter
waits fol' operator
input.
After
a line has been entered}
it
is
scanned ror
the
first
valid
file name specification.
IT
no valid
rile
name
is
recognized~
the standaT'd message
WHAT?
will be displayed and a new input prompt shown.
If
the first
encountered
file
name
specification
contains a valid file
name,
it
will be used to search the directory.
The
de-Pault
suffix
IICM" and
the de-Fault logical unit number zei'O will be
supplied
by
the
MDOS
command
interpreter
if
none
are
explicitly
entered by the operator.
If the file name
i~
not
found in the directory specified by the logical unit
numberl
the
"WHAT?"
message shown above will be displayed
and
another
input prompt shown.
If the file name is round}
it
must
be
the
name
of
a
file
that
contains
a
command-:-inter-pT-eter-loadable
program.
That is;
the file
must
be
in
the memory-image format and must have a starting load
address that is greater than the value contained in the
MOOS
variable
ENDOS$
(greater
that
$lFFF)'
If the file passes
these testsl
its
contents
are
automatically
loaded
into
memory
and
given
control at the starting execution address
contained in the filets RIB.
The loaded program can then extract parameters from
the
MDOS
command
line
buffer.
The
pointer
into
the buffer
Page
24-20
Advertisement
