Basic computer language commands

Basic computer programming language

INP Function

Purpose:

To return the byte read from machine port n.

Syntax:

INP(n)

Comments:

n represents a valid machine port number within the range of 0 to 65535.

The INP function is one way in which a peripheral device may communicate with a GW-BASIC program.

INP is the complementary function to the OUT statement.

Examples:

100 A=INP(56)

Upon execution, variable A contains the value present on port 56. The number returned will be within the range of 0 to 255, decimal.

The assembly language equivalent to this statement is

MOV DX,56
IN AL,DX

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