Tandy TRS-80 - Page 96

APPENDIX
H.
BASIC
WORD
DISCUSSED
CVNistring
variable)
50
Converts
a
5-byte coded
string
(created by
MKN$) back to
the number it
represents.
x=cvnia$)
DIRdrive
number
11
Displays a
directory
of the disk
in the drive
number
you
specify. If you omit
the
drive
number, the
Computer will use
drive 0. (Unless you use
the DRIVE com-
mand to
change
this default.)
This is
a
typical
directory display:
MYPROG
BAS B 3
Y0URPR0G
BAS A 1
HERDATA
DATA 1
A 5
USRPROG
BIN 2 B
2
The
first column
is the name
of the file. The second
column is its
extension. The
third is the
file type
(0
=
BASIC program,
1
=
BASIC data file, 2
=
machine lan-
guage
file, 3
=
editor source file).
The fourth column is the
storage format
(A
=
ASCII, B
=
Binary).
The fifth column is the
file length in granules.
DIR0
DIR
DRIVE drive
number
11-15
Changes the
drive default to
the drive
number
you
specify.
If
you do
not use the
DRIVE
command, the
Computer
will default to drive 0.
DRIVE 1
DSKINIdriue
number
8
Formats a
disk
in the drive
number you specify.
Executing this
command will
erase
memory.
DSKINI0
DSKINI1
DSKI$ drive
number, track,
sector, string
variablel, string variable2
61-62
Inputs data
from a
certain sector
within
a
certain track
on the disk in
drive
number. The first 128 bytes
of data are
input into string
variablel; the
second
128 bytes
into string
variable2.
DSKI$
0.
12
.
3i M* t N$
DSKO$
drive^number,
track,
sector, stringl, string2
61-62
Outputs
stringMata
into the sector,
track, and drive
number
you
specify,
stringl
is output
into
the first
128
bytes
of the
sector; string2 is output
into the second
128 bytes. Used
improperly, this command
could garble the
contents of the
disk.
DSK0$ 0, 2,
1 , "FIRST
DATA", "SECOND DATA"
EOF
(buffer)
27
Returns a
if there
is more data to be
read in the
buffer
and
a
-
1
if there is
no
more data
in it. (See OPEN
for
buffer
numbers.)
IF
EOFU)
= -1
THEN CLOSE
«1
FIELD
#
buffer,
field
size
AS
field
name, . .
.
48-49
Organizes
the space
within a
direct access
buffer
into fields. (See
OPEN for
buffer
numbers.) You
specify the size and
name of each
field.
FIELD
»1»
10 AS A*. 12
AS B$
.
5 AS C$
86