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INP

Implementation Note

⚠️ Not Implemented: This feature requires direct hardware I/O port access and is not implemented in this Python-based interpreter.

Behavior: Always returns 0

Why: Cannot access hardware I/O ports from a Python interpreter. This function is specific to systems with memory-mapped I/O or port-based hardware interfaces.

Alternative: There is no modern equivalent for hardware port I/O. For memory access, use PEEK, though note it also returns emulated values.

Historical Reference: The documentation below is preserved from the original MBASIC 5.21 manual for historical reference.

Syntax

INP (I)

Description

Returns the byte read from port I. I must be in the range 0 to 255. INP is the complementary function to the OUT statement.

Example

100 A=INP(255)

See Also

  • FRE - Arguments to FRE are dummy arguments
  • HELP SET - Display help for a specific setting
  • INKEY$ - Returns either a one-character string containing a character read from the terminal or a null string if no character is pending at the terminal
  • LIMITS - Display resource usage and interpreter limits
  • NULL - To set the number of nulls to be printed at the end of each line
  • PEEK - Returns the byte (decimal integer in the range 0 to 255) read from memory location I
  • RANDOMIZE - To reseed the random number generator
  • REM - To allow explanatory remarks to be inserted in a program
  • SET (setting) - Configure interpreter settings at runtime
  • SHOW SETTINGS - Display current interpreter settings
  • TRON/TROFF - To trace the execution of program statements
  • USR - Calls the user's assembly language subroutine with the argument X
  • VARPTR - Returns the memory address of a variable
  • WIDTH - To set the printed line width in number of characters for the terminal or line printer