Inp

previous page next page

Inp

Returns a value at a hardware port.

Syntax

Declare Function Inp ( ByVal port As UShort ) As Integer

Usage

value = Inp(port)

Parameters

port

Port number to read.

Return Value

The value at the specified port.

Description

This function retrieves the value at 'port' and returns immediately.

Example

'' Turn off PC speaker Out &h61,Inp(&h61) And &hfc

Platform Differences

In the Windows and Linux versions three port numbers (&H3C7;, &H3C8;, &H3C9;) are hooked by the graphics library when a graphics mode is in use to emulate QB's VGA palette handling. This use is deprecated; use Palette to retrieve and set palette colors.
Using true port access in the Windows version requires the program to install a device driver for the present session. For that reason, Windows executables using hardware port access should be run with administrator permits each time the computer is restarted. Further runs don't require admin rights as they just use the already installed driver. The driver is only 3K in size and is embedded in the executable.