Radio Shack TRS-80 model III Owner's Manual page 90

TRSDOS
$CMDDOS—
17052/X'429C
This
routine
executes
a
trsdos
command
and
returns to the
caller.
Entry Conditions
(HL)
=
Text of
trsdos
command,
terminated
by xod:
Exit
Conditions
All registers are
changed.
Caution:
trsdos
commands
will
overlay
ram
up
to
x'6FFF/
$CMDTXT
—
16933/X'4225'
This
is
the
start
address of a buffer containing the
last
command
line
entered
under trsdos ready. Using
this
buffer,
your
program
may
recover parameters
that
were
included
in
the
last
command
line.
For example, given
a
program named
editor/cmd,
we
want
the
operator
to
select
an input
file
name when
the
program
is
loaded
and executed from trsdos
ready:
trsdos
ready
editor myfile
The program, editor, can recover
the
name
of
the
file in
the
scmdtxt
buffer.
Note:
On
entry to a
program,
(hl)
=
First
non-blank
character following the
program name.
$MEMEND—
17425/X'4411'
This storage location contains the highest address available.
It is
normally
the
same
as the
physical
end
oPram,
but
you
may
change
it
for special purposes.
The
address
is
in
lsb,
msb
sequence.
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