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A comment on Why the Z-80's data pins are scrambled. Parent comment

Re:Why the Z-80's data pins are scrambled by crb3 on Friday September 26, 2014 @10:09PM (#8375814)
IIRC 7-bit refresh. Good for 4116's; 4164's needed extra logic.
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Re:Why the Z-80's data pins are scrambled by apk17 on Sunday September 28, 2014 @04:46AM (#8379270)
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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