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BASIC-SO Commands and Statements
The example below shows a typical use of OPEN in an 110 program.See Chapter 5
for further details
of
disk random 110.
10
OPEN
"R"
,#3, "F1
:PERSON"
20
GET
#3,1
30
FIELD #3,20 AS N$, 9 AS
SS$
40
PRINT N$,SS$
RUN
JONES,
JOHN
J.
517317010
Ok
OPTION BASE
The OPTION BASE command
is
used to begin indexing
of
arrays
at
1 or
O.
By
specifying
an
argument
of
0 or
1,
you can begin all arrays
at
0
or
1.
If
present,
OPTION BASE should precede all DIM statements and array references.
If
OP-
TION BASE
1
is
not specified, 0
is
the default value.
OPTION BASE
011
OUT
The OUT statement writes the specified value
to
the specified 110 port. The value
is
an integer expression in the range 0 to 255.
OUT
port
number,
expression
This example rings the bell
on
Intellec development systems using the RS-232 port.
OUTOF6H, 7
POKE
The POKE statement places the specified value into the memory location specified.
The specified value
is
an expression that must round to an integer in the range 0-255.
POKE
can also accept hexadecimal and octal arguments, even though octal and hex
constants over 32767 (decimal) are interpreted by
BASIC-80
as
negative numbers.
It
does this by adding 65536
to
such arguments.
POKE
location,
expression
POKE OFFFFH, 0
POKE
65535,0
POKE 1777770,0
POKE
-1,0
The instructions above set the top byte of memory to 0 in
an
Intellec development
system having 64K
of
memory. Before using POKE, you should use the CLEAR
command to reserve free memory. A
POKE into BASIC
or
system code may cause
BASIC
or
other software to fail.
6-15