Data is from the 1978 Intel databook: 2101A/8101A-4 256x4 bit SRAM 2101-1 +---()---+ A3 | 1 22| VCC A2 | 2 21| A4 A1 | 3 20| R/W A0 | 4 19| /CE1 A5 | 5 18| OD A6 | 6 17| CE2 A7 | 7 16| DO4 GND | 8 15| DI4 DI1 | 9 14| DO3 DO1 |10 13| DI3 DI2 |11 12| DO2 +--------+ manufacturer: Intel and AMD comment: Discontinued?