Parallel port logic analyzer
posted Jan 28th 2008 11:34pm by Will O'Brienfiled under: misc hacks

After reading the latest hackit post, [Ben] sent in this older, but simple logic analyzer. The software was written in windows, but the circuit is simple enough, and most hackers I know have more computers than immediate family members. The circuit uses a HC245 octal bus transceiver to feed the 8 data lines on the parallel port. (You can use a variety of chips for this application, most CMOS buffers will probably be fine.)





In other words, this just connects stuff directly to your parallel port. Should be very easy to make a Linux driver for this. Too bad my printer is parallel… time to upgrade :D
I think it would be nice to add some kind of playback support. Since those pins on the parallel port are bidirectional, it should be simple enough. Time to pull out my soldering iron!
Posted at 12:53 am on Jan 29th, 2008 by atrain