Received WC27C512 EEPROM today and tested it in a socket 7 MB (Vpp set to 12V, value checked ok with a multimeter) using my DIP 28 to DIP 32 adapter => and it doesn't work (you can only read data) 🤣
Flash EPROM routines for programming must be too different from EEPROM ones 😵
Tested with different programs and even forcing flash lead to "unknown flash" message... (yeah it's not a flash EPROM after all 😁)

Guess I will have to buy a programmer after all 🤣