As far as I understand, common practice was lapping. Yield was always acceptable. It is still being done now, for open-source hardware too, like here : http://

As far as I understand, common practice was lapping. Yield was always acceptable. It is still being done now, for open-source hardware too, like here : http://zeptobars.ru/en/read/KR580VM80A-intel-i8080-verilog-reverse-engineering http://zeptobars.ru/en/read/KR580VM80A-intel-i8080-verilog-r...