3 ms·
Some anti-reverse-engineering work was put into the Z80 chip 45 years ago. https://retrocomputing.stackexchange.com/questions/11143/in-the-original-z80-layout-w
by abbeyj 7y ago
Some anti-reverse-engineering work was put into the Z80 chip 45 years ago.
https://retrocomputing.stackexchange.com/questions/11143/in-the-original-z80-layout-where-are-the-traps-located-and-what-are-their-ef https://retrocomputing.stackexchange.com/questions/11143/in-...
- Taniwha 7y agoBefore 1984 there was no copyright on the contents of chips, it was completely legal to create masks from a competitor's chips and sell them - people used to create on-chip structures designed to fool the optical processes that were used to do this