name: x20c04 function: 512*8 CMOS Nonvolatile Static RAM package: Plastic CERDIP,28 manufacturer: Xicor +--()--+ *ne | 1 28| Vcc nc | 2 27| *we a7 | 3 26| nc a6 | 4 25| a8 a5 | 5 24| nc a4 | 6 23| nc a3 | 7 22| *oe a2 | 8 21| nc a1 | 9 20| *ce a0 |10 19| i/o7 i/o0 |11 18| i/o6 i/o1 |12 17| i/o5 i/o2 |13 16| i/o4 Vss |14 15| i/o3 +------+ This pinout came from the Chipdir: http://www.chipdir.org/ name: x20c04 function: 512*8 CMOS Nonvolatile Static RAM package: LCC,PLCC,32 manufacturer: Xicor +--------+----------+----------+---------+ | 1 - nc | 9 - a2 | 17 - nc | 25 - *oe| | 2 - *ne| 10 - a1 | 18 - i/o3| 26 - nc | | 3 - nc | 11 - a0 | 19 - i/o4| 27 - nc | | 4 - a7 | 12 - nc | 20 - i/o5| 28 - nc | | 5 - a6 | 13 - i/o0| 21 - i/o6| 29 - a8 | | 6 - a5 | 14 - i/o1| 22 - i/o7| 30 - nc | | 7 - a4 | 15 - i/o2| 23 - *ce | 31 - *we| | 8 - a3 | 16 - Vss | 24 - nc | 32 - Vcc| +--------+----------+----------+---------+ This pinout came from the Chipdir: http://www.chipdir.org/