Zilog Z8002

The Z8000 was made in two main versions: The higher end Z8001 which, by use of segmentation, could address up to 8Mb of memory, and the Z8002 which could only address 64k. Memory segmentation works by essentially having 2 address buses. First a 7-bit segment is selected (so 128 segments possible) then the word is selected with a 16 bit address. This required an extra 7 pins and thus the Z8001 came in a 48 pin DIP.