Light Pens Tested with Microsoft Basic (57342)

SUMMARY

The following light pens by the LightPen Company were tested with QuickBasic Version 4.50, Microsoft Basic Compiler Versions 6.00 and 6.00b, and Microsoft Basic Professional Development System (PDS) Version 7.00:

Light Pen
Soft Pen

MORE INFORMATION

The following code example is from Page 315 of the "Microsoft QuickBasic 4.0: Basic Language Reference" manual under the example for the PEN function. This code example was used to test the light pen. If you do not have a light pen, pushing both buttons on the mouse at the same time simulates a light pen being on.

The code produces an endless loop to give the current position and status of the pen.

Compile and link with the following command lines:

BC test.bas; LINK test.obj,,,BRUNxx.Lib;

Code Example

CLS
PEN ON
DO
   p = PEN(3)
   LOCATE 1,1: PRINT "Pen Is ";
   IF p THEN PRINT "down" ELSE PRINT "up"
   x = PEN (4) : y = PEN(5)
   PRINT "x=" x, "y=" y
LOOP