Radio Shack TRS-80 Owner's Manual page 105

—
^
^
^:%a-:^-w
a
$CMDDOS
—
17052/X»429C
This routine executes a
trsdos
command
and
returns
to the
caller.
Entry Conditions
(HL)
=
Text of
trsdos
command,
terminated by
X'OD.'
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
of
ram,
but
you
may
change
it
for special purposes.
The
address
is
in
lsb,
msb
sequence.
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