IIRC 7-bit refresh. Good for 4116's; 4164's needed extra logic. | Hacker News

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		crb3 on Sept 27, 2014 \| parent \| context \| favorite \| on: Why the Z-80's data pins are scrambled IIRC 7-bit refresh. Good for 4116's; 4164's needed extra logic.

apk17 on Sept 28, 2014 [–]

7 bit, indeed. But there were variants of the 64k DRAMs that only required 7 bit refresh, specifically for this use case.

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