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How do you know what the two inputs will be for this 2-to-4 decoder? Also, what changes would be made to the circuit if the 2 data lines are not the same?

The original problem:

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I drew the circuit, but I'm confused about the two things mentioned prior.

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  • \$\begingroup\$ 1) Normally they will be the next highest address lines above those connected to the memories. That gives one contiguous memory space. 2) WHAT two data lines? This question makes no sense : each memory has 16 data lines and you need 32. \$\endgroup\$ – Brian Drummond 2 days ago
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Generally you would drive your two decoder inputs with A15 and A16 for splitting 128K into 4 - 32K segments. You'll drive your 32K chips with A0-A14.

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