Real DEC Keyboard (Was: C.Itoh keyboard repair)

Mark Wickens wrote: Looking at those pictures, it seems the CIT-220+ keyboard is not all that dissimilar in electrical design from the DEC one. It uses the same kind of leaf switches but mounted in a completely different way, and the leaves themselves don't act as electrical contacts on the CIT one, just as secondary springs to push the thin contact plates. If I remember correctly, the CIT keys look sort of like this if chopped in half down the middle: II-||-II ICLKK I ICLKK I _CLSS _ |C LS | -------- D where C is the contact plate assembly S is the main spring K is the bottom of the key plunger L is the leaf spring _ is the place where the key plastic comes into two halves I is the tab which holds the bottom half onto the top half - is the bottom of the key D is the solder tabs for the contact plate | are the walls of the bottom part of the key The leaf springs look like this if zoomed in, if I remember right: side: | | < \ \ front: _______ |_ _| | | | | |_._| / _ \ |_/ \_| I also worked out the complete key matrix for the CIT keyboard at one point, I'll see if I can find it. Jonathan Gevaryahu jzg22 at drexel.edu