name: 54AS870 function: Dual 16x4 Reg package: DIP,24 manufacturer: TI added-by: Long John Silicon +--()--+ S0 | 1 24| VCC 1A0 | 2 23| S1 1A1 | 3 22| 2A3 1A2 | 4 21| 2A2 1A3 | 5 20| 2A1 1W! | 6 19| 2A0 S2 | 7 18| 2W! DQA1 | 8 17| S3 DQA2 | 9 16| DQB4 DQA3 |10 15| DQB3 DQA4 |11 14| DQB2 GND |12 13| DQB1 +------+ This information was added by a third party and may be incorrect. This pinout came from the Chipdir: http://www.chipdir.org/