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If you are talking about RAM chips that only store 128 bytes of memory each (I know of no such chips), then you would need 8 of them.

128 = 27

1024 = 210

210 / 27 = 23

I'm not sure what "128 4" means, but if you mean you can store 128Bx4 on each chip, then you need 2 such chips.

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