A logic analyzer isn’t a “must-have” tool, especially for hobbyists. Most measurements of logic signals can be made with an oscilloscope. But it doesn’t hurt to have one, significantly; it costs cents literally.
One condition has to be met – your computer must be equipped with a parallel port as this device is built for it. It uses only one chip – octal bus transceiver 74HC245N. Another is a bunch of resistors and connectors. On the PC side, you will need a logic analyzer program that can be downloaded here. [Source]