F3851

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Fairchild F3851 / F3856 Program Storage Unit

           +-----+--+-----+
   /I/O B7 |1    +--+   40| DB7
   /I/O A7 |2           39| DB6
       Vgg |3           38| /IO B6
       Vdd |4           37| /IO A6
  /EXT INT |5           36| /IO A5
  /PRI OUT |6           35| /IO B5
     WRITE |7           34| DB5
         Φ |8           33| DB4
  /INT REQ |9           32| /IO B4
   /PRI IN |10          31| /IO A4
     /DBDR |11  F3851   30| /IO A3
STROBE/NC* |12          29| /IO B3
     ROMC4 |13          28| DB3
     ROMC3 |14          27| DB2
     ROMC2 |15          26| /IO B2
     ROMC1 |16          25| /IO A2
     ROMC0 |17          24| /IO A1
       Vss |18          23| /IO B1 
    /IO A0 |19          22| DB1
    /IO B0 |20          21| DB0
           +--------------+


Datasheet

Fairchild F3851 / F3862