Amazingly there is a TV program from 1983 showing manufacturing process of this very CPU :o
https://www.youtube.com/watch?v=KHl6m93Hay0#t=24
From die shots and this program (showing different masks) it appears Polish version was almost a straight copy of the Intel, with small modifications (different feature sizes, additional debug pads).
Elwro, Polish calculator manufacturer, designed accounting system (Elwro 500/513/523) based on MCY7880, with 8-512KB ram, two 8 inch floppies, printer and a monitor made out of modified 12 inch _camping TV_ (Neptun 150) :))), all running CP/M 2.2 (pirated and translated to Polish).
Yields were terrible, not surprising when you watch this clip and see chemical baths done manually by flipping wafers in liquids like fries at a fast food restaurant :) Popularity of this computer system forced CEMI to import KR580VM80A from USSR, and encapsulate them with CEMI logo (to save face I guess). Few people decapped MCY7880, and you mostly find russian dies inside.
Amazingly there is a TV program from 1983 showing manufacturing process of this very CPU :o
https://www.youtube.com/watch?v=KHl6m93Hay0#t=24 From die shots and this program (showing different masks) it appears Polish version was almost a straight copy of the Intel, with small modifications (different feature sizes, additional debug pads).
Elwro, Polish calculator manufacturer, designed accounting system (Elwro 500/513/523) based on MCY7880, with 8-512KB ram, two 8 inch floppies, printer and a monitor made out of modified 12 inch _camping TV_ (Neptun 150) :))), all running CP/M 2.2 (pirated and translated to Polish).
http://www.elwro.zafriko.pl/kat/mikrokomputery/elwro_500
google translated journal of one of the engineers: http://translate.google.com/translate?hl=en&sl=pl&u=http://w...
Yields were terrible, not surprising when you watch this clip and see chemical baths done manually by flipping wafers in liquids like fries at a fast food restaurant :) Popularity of this computer system forced CEMI to import KR580VM80A from USSR, and encapsulate them with CEMI logo (to save face I guess). Few people decapped MCY7880, and you mostly find russian dies inside.