saw his EEG project >waiting to be revived. I was the prime instigator in the HAL-4 project. When I lived in CT I was a member of the CT Computer Club with Steve. He was always looking for ideas for his monthly column. Being a psychologist (but almost EE major) I had worked with biofeedback and thought a low cost EEG unit would be cool. I wrote the specs for the hardware and software and the non-technical parts of the article while 2 other club members did the hardware and software respectively, and Steve Many hundreds of these kits were sold over the years - I know because I enjoyed a $3/unit royalty on each one :-) Never-before-revealed-fact: I spec'd the design to have two switches which the operator could use to signal awareness of up to 3 internal states to see if they could be correlated with the brainwave pattern. In fact, I was inspired by Tim Leary's 'experiential typewriter' which he speculated could be used similarly when he first started experimenting with LSD. Brainwave feedback and analysis have progressed greatly in the past 20+ years and there's no reason why the PC software couldn't be re-written, though not many people have a serial port to which to connect HAL. I suppose an inline serial USB converter could be used. I believe there is still open source hardware specs and description available on the web. Bob Stek Former Saver of Lost Sols