Microsoft KB Archive/19854

Function 13 - Light Pen Mode On PSS ID Number: Q19854 Article last modified on 05-14-1993 PSS database name: H_Mouse

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MS-DOS

Summary:

The following are details on enabling the mouse light pen emulation:

FUNCTION 13: - LIGHT PEN EMULATION MODE ON Inputs: AX = 13 Outputs: None

When in the light pen mode, the BASIC PEN function returns the cursor position at the last pen down. This is equivalent to both buttons pressed. The pen is considered off screen when both buttons are UP. The pen information can be accessed using INT 10h, Function 4 (ah = 4).

Note that Function 0 enables the Light Pen Emulation mode.

Additional reference words: 7.00 7.04 7.05 8.00 8.10 8.20 9.00

Copyright Microsoft Corporation 1993.