A logic analyzer using the PCs parallel port

Open Source DIY logic analyzer

Courtesy/Thanks to: JWA Systems

Description: A logic analyzer is useful in electronic development and debugging, especially where fast logic circuits are involved with lots of signals whose relations have to be verified or examined.
A logic analizer is a like a recorder for digital signals. During a certain (small) period of time, the state of a few digital lines can be recorded to a file. An event can be specified to signal the start of the recording, i.e. line 1 toggeling from 0 to 1.
This recording can be viewed afterwards, allowing for zooming and scrolling in the time domain.