On Sun, May 16, 2010 at 5:15 PM, Bruce Holland <holland at pacbell.net> wrote: A company called Elenco still produces these. If it's the same as the radio shack version (I have the radio shack and it's very similar) then the manual is here: http://manuals.elenco.com/manuals/mx907.pdf Here's the homepage for the company: http://www.elenco.com/ And here's the site listing their electronics kits: http://www.sciencekits.com/electron.html Here's the product page for the 200-in-1 kit: http://www.elenco.com/MX-907.htm I loved those kits - I had four of them. My favorite was the microcomputer training one - where you keyed in assembly language programs via a spring-action hex keypad.