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The 64 was a keyboard sized unit that ran basic and displayed NTSC video on any television. wikipedia 
Heart Rate Calculator counts milliseconds between keystrokes and converts that to a pulse rate.
Commodore 64
Commodore 64Uploaded image
The 64 was a keyboard sized unit that ran basic and displayed NTSC video on any television. wikipedia
Heart Rate Calculator counts milliseconds between keystrokes and converts that to a pulse rate.