name:         402038
function:     serial multiplexer (4player adapter)
package:      28 pin DIP,28
manufacturer: motorola
added-by:     rob
comment:      (?) maybe isolated ports

                 +--()--+
   vcc sense (?) | 1  28| VCC
         vcc (?) | 2  27| clk_out 3mHz
          p4s_in | 3  26| clk2_in 3mHz
          p3s_in | 4  25| vcc (?)
          p2s_in | 5  24| n.c. (?)
p1s_out (master) | 6  23| vcc (?)
         p4s_out | 7  22| p3s_clk
         p3s_out | 8  21| p4s_clk
         p2s_out | 9  20| p2s_clk
 p1s_in (master) |10  19| p1s_clk (master)
         gnd (?) |11  18| vcc (?)
         gnd (?) |12  17| vcc (?)
         gnd (?) |13  16| vcc (?)
             GND |14  15| vcc (?)
                 +------+

This information was added by a third party and may be incorrect.

This pinout came from the Chipdir:
http://www.chipdir.org/