ttl - I have an SN7489N Memory IC which is not lighting-up an LED whose positive-end is connected to one of the output pins via a 220 Ohms resistor - Electrical Engineering
TTL-series 74189 SRAM demonstration
digital logic - TTL tri-state 16x4 RAM chip not working - Electrical Engineering Stack Exchange
PDF) 74189 Datasheet - 64-Bit Random Access Memory