Tandy 1000 Basic Reference Manual page 190

Chapter 10 I
BASIC Keywords
IOCTL
Advanced Statement
IOCTL [#lbuffr,string
Sends
a
control data string to a device driver. Control data can
be sent to a drive only after it has been opened.
Buffer
is the number assigned
to the driver when you opened it.
The number sign
(#)
is optional. It is provided for compatibility
with other BASICs.
String
is a string expression containing a series of commands
called "control data." The commands are generally 2 to 3 charac-
ters long and may be followed by a n alphanumeric argument.
The commands are separated by semicolons
(;).
String
may be a
maximum of 255 bytes.
For
more information on device drivers, see the
Programmer's
Reference
manual for your computer.
It
is available at your Radio
Shack Computer Store.
Example
If you write your own driver to replace PRN
to set the page
length, the IOCTL command may be:
PLn where n is the new page length.
To open the new
PRN
driver and set the page length at 56 lines
per page, use the following statements:
1 0 OPEN "PRN"
FOR OUTPUT
a 5
1
20 I O C T L 1 , " P L 5 6 "
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