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- │ IOVIEW: A utility to view an IBM-PC's memory mapped I/O ports │
- │ Written by J. Ashley Roeckelein. Copyright (c) 1990 Ad Infinitum Software. │
- ╘═════════════════════════════════════════════════════════════════════════════╛
- This program allows one to view the activity on an IBM-PC (or compatible)
- memory mapped I/O ports. The program displays one page (256 bytes) of port
- activity at once, and is constantly updated. The full I/O space (256 pages,
- or 64K) is accessible via the arrow keys.
-
- To start the program, simply type IOVIEW at the DOS prompt. The arrow
- keys will page through the I/O space. To exit the program, press ESC.
-
- Although you won't need this program very often, it can be useful once in
- a while. For instance, I wanted to know where the joystick port was, and I
- did not have any documentation on the joystick adapter. By using this program,
- I was able to determine the port address (201 hex) and the values returned by
- the joystick buttons (f0 hex for no button pressed, d0 hex for the left button,
- and e0 hex for the right button). Enjoy! (and look for other A.I.S. products!)
-
- This program may be freely distributed as long as: (1) no charge is made
- for the program (except for a small disk handling charge not to exceed $15),
- and (2) all files remain in their original, unmodified state.
-