address
PEEK
PEEK
returns the contents of the specified memory location.
PEEK
is
the
function counterpart of the
POKE
statement.
Format:
PEEK(address)
where:
is
a numeric constant. variable, or expression
specifying the address of the location whose
contents
are
to
be
fetched.
o
~
address
~
65535.
Any memory locations from 0 to 65535 can
be
PEEKed
except the block of
system locations from 49152
to
57599; these locations contain the
8K
BASIC in-
terpreter and have been PEEK-protected to discourage examination of proprietary
software. The protected
area
returns a
PEEK
value of
O.
Locations of interest
that
vou
might
want
to
PEEK
at are discussed in Chapter
6.
Examples:
?PEEK(1)
Prints contents of memory location
1.
A=PEEK(20000)
ST
ST
represents the current value of the PETs 1/0 status word. This
word
is
set
to certain values depending on the results of the last
input/output
operation that
affects the status word.
Format:
ST
ST
values for tape cassette 1/0 operations are shown in Table 4-3.
Table
4-3.
ST
Values
for
Tape
1/0
ST Bit
ST Numeric
Tape READ Tape VERIFY
Position
Value
0 1
1 2
2
4
Short black
Short black
3
8 Long black Long black
4
16
Unrecoverable
Any mismatch
read
error
5
32
Checksum
Checksum errer
error
6
64
End
of file
7
-128
End
of tape
End
of tape
162
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