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Radio Shack TRS-80 PC-2 - Page 14

Radio Shack TRS-80 PC-2
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• INPUT$
does
not
attempt
to
evaluate
input
as an
arithmetic
expression
but
treats
it
strictly
as a
charac-
ter
string.
INPUT$
is
effective
if,
and
only
if.
KI
has been
routed
to
the
RS-232C via a
SETDEV
command
(that
is,
SETDEV
KI
has been specified so
that
data
requests
normally
filled
from
the
keyboard
are filled
from
the
RS-232C).
It
is
used
with
the
same
general
syntax
as INPUT,
the
only
restriction being
that
the
I
NPUT$
variable
must
be a
string variable.
If
INPUT$ has a
quotated
string
prompt,
as
in
INPUT$
"LOAD
DATA";
A$,
the
prompt
is
handled
in
accord-
ance
with
any
current
display
output
(DO)
routing.
For
example,
enter
a
command
sequence
similar
to
the
following:
100
SETDEV
KI
110
INPUT$
A$
INPUT%
Fill a String Array
with
RS-232C
Data
INPUT%
"prompt";
variable
prompt
is
the
message
you
want
displayed.
prompt
is
optional;
if
omitted,
a
question
mark
(7)
will be
displayed.
variable
represents
the
data
to
the
typed
in
and
must
be a
dimensioned
string variable.
INPUT%
is
another
variant
of
BASIC's INPUT
function.
Its sole
function
is
to
load an
entire
array
of
non-numeric
data
from
the
RS-232C.
22
INPUT%
is
effective
if,
and
only
if,
KI
has been
routed
to
the
RS-232C via a
SETDEV
command
(that
is,
SETDEV
KI
has been specified so
that
data
requests
normally
filled
from
the
keyboard
are filled
from
the
RS-232C).
The
syntax
of
an INPUT%
statement
takes
the
same
form
as
for
BASIC's
normal
INPUT,
with
the
single
exception
that
the
variable
must
be a
dimensioned
string variable
in
the
form
A$
(*).
Any
prompt
supplied
with
INPUT%
is
not
processed
according
to
the
current
DO
routing,
but
is
always dis-
played.
When INPUT%
is
executed,
consecutive
characters
receiv·
ed
from
the
RS-232C
port
are placed
in
consecutive
array
elements
in
row-major
order,
with
each
array
element
being filled
to
its
maximum
dimensioned
length
from
left
to
right.
INPUT%
execution
stops
when:
• a carriage
return
is
received
•
the
array
is
full.
Array
elements
which are
not
filled
during
INPUT% are
nulled (set
to"
H).
For
example,
to
declare
a string
array
Z$
as
having
three
rows
and
four
columns
of
two-character
elements,
then
fill
that
array
from
RS-232C
input,
enter
a
command
sequence
similar
to
the
following:
100
DIM
Z$
(4,3)
*2
110
SETDEV
KI
120
INPUT%
"RECEIVING
ARRAY";
Z$
23

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