<Here's some information. It's a 256*1 bit PMOS static RAM, access time <850ns or better. It runs off +5V and -9V (as usual for PMOS). The pinout <is : That was the fast part. the lowcost part was 1.5us. it was very slow and in 1972 when I first encounterd it, they were $15 a copy too! < <1 A5 <2 A7 <3 A6 <4 Vd (-9V) <5 Vcc (+5V) <6 A4 <7 A0 <8 Vdd (-9V) <9 A2 <10 A1 <11 A3 <12 Data In <13 Data Out <14 Data Out/ <15 R/W <16 CS/ Correct. according to my data sheet. Allison