name: ANF090494 function: Keyboard Mux package: 40-pin DIP,40 manufacturer: Intel added-by: Pete Nelson comment: This is mostly a tested guess +--()--+ clk | 1 40| 5V+ NC | 2 39| return a tank 1 | 3 38| return c tank 2 | 4 37| return d ? | 5 36| return e out | 6 35| return f GND | 7 34| return g NC | 8 33| return q NC | 9 32| return p scan h |10 31| return o scan g |11 30| return n scan f |12 29| return h scan e |13 28| return m scan d |14 27| return i scan c |15 26| return j scan b |16 25| return k scan a |17 24| return l LED 'scr' (-) |18 23| return r LED 'num' (-) |19 22| return b GND |20 21| LED 'caps' (-) +------+ This information was added by a third party and may be incorrect. This pinout came from the Chipdir: http://www.chipdir.org/