Posted by Karl on
URL: https://www.es-forum.com/DIY-alternative-3-in-1-low-EMF-computer-Mouse-Keyboard-Microphone-tp4030078p4030208.html

I have two old PalmOS devices with keyboards that don't bother me as much. Both are available cheaply on eBay and Amazon, and one of the manufacturers made a smart keyboard that would plug directly into a PC or Mac. I have one of those on order, and I would be happy to post results when I test it.

Old Palm infrared keyboards do have an active matrix, but it runs at only ~4 Hz. I find that a lot more tolerable than most keyboards. The matrix on an Alphasmart Dana runs at ~60 Hz, which also doesn't bother me as much.