Free Oscilloscope

I had to do a mini project for my college to get some marks out of 50.I came across many projects and selected the project called "PC based Oscilloscope".My aim was to make a real cheap PC based oscilloscope.One of them is this LPTScope called for it uses the LPT port of the PC.
For making this LPTScope person needs some knowledge on the LPT port of the PC.I will try to give enough information on the LPT port.

Specifications of this oscilloscope:

This table shows real max sample rates you can expect from this oscilloscope:

Machine type	Sample rate (kSamples/sec)
Pentium MMX at 233 MHz	180
Pentium4 at 1.6 GHz	257
AthlonXP 1.7 GHz	267

Image shows the screenshot of the software which turns your
computer into a free oscilloscope.

This project uses two resourses which can be divided into two parts.You guessed it write Hardware and Software.

Hardware

Hardware in this project is not so hard to understand as it is a very simple circuit.The Analog to Digital Convertor called the ADC is implemented using the ADC0820 IC which is a 20 pin package.The components required for this project are listed below.

Component	Quantity	Rating
Resistors	9	1K
Resistor	1	1M
Resistor	1	10K
Capacitor	1	100nF
Capacitor	1	100uF
Diode	1	IN4148
Zener Diode	1	IN4733A
Integrated Circuit	1	ADC0820
Regulator	1	IC7805
Supply	1	9V

Software

Nothing important to say about the software as it is provided freely.

Download lptscope program for windows (Version 1.1) here
Download source of lptscope (Version 1.1) here
Download lptscope program for windows (Version 1.2) here
Download lptscope source for windows (Version 1.2) here
Download lptscope software for DOS here

The software is pretty easy to use and has an additional capability for testing your printer port whether it is a bidirectional one or not.It also has an ability to switch among ECP and EPP automatically.

More on this is coming soon....