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Why the Z-80’s data pins are scrambled

Z80-Labeled-Bus

Ken Shirriff’s blog: Why the Z-80’s data pins are scrambled.

If you look closely at the datasheet for a Z-80 chip, you’ll notice the data pins are in a random-looking order. The address pins (A) are nicely arranged in order counterclockwise from 0 to 15, but the data pins (D) are all shuffled around.[1] After studying the internals of the chip, I have a hypothesis to explain this.


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