Atmel On the PC keyboard PS 2 AT89C2051 keylogers circuit connection cable connects to the circuit between what is written in the wake of the program running on the pc upon AT24C512 writes eeprom eeprom reading with
KeeLog has decided to release an early version of it’s hardware keylogger family to the public domain. Including full firmware & software source code, keylogger hardware electrical schematics, and documentation.
For more detail: Atmel AT89C2051 hardware keylogers circuit with using AT89C2051 microcontroller