Yes, what Ken said. There was another way to do it if the memory chips were already wide enough. Some static RAMs had multiple enables of different polarities.

Yes, what Ken said. There was another way to do it if the memory chips were already wide enough. Some static RAMs had multiple enables of different polarities. For example, the 6264 had an E1* (active low) and an E2 (active high)... wire an address bit to E1* on one chip and E2 on the other and you'll get the decoding done without adding a third chip. http://users.ece.utexas.edu/~valvano/Datasheets/MCM6264.pdf http://users.ece.utexas.edu/~valvano/Datasheets/MCM6264.pdf