- 2x 2200-Ohm resistor
- 2x diodes
Align the two 2200-Ohm resistors so that their red stripes are closest to the female serial port adapter, and then connect and solder the resistors to pins "4" and "7." If you look at the front of the serial port adapter, pin "4" is the fourth pin to the right on the top row. Pin "7" is the second pin to the right on the bottom row of pins.
Solder one of the diodes to the 2200-Ohm resistor you connected to pin "4" on the adapter. When connecting the diode, ensure the cathode end -- black end – connects to the resistor.
Connect the 9-pin serial cable to the second computer and the female serial port adapter used for the EEPROM reader adapter.
Source: https://smallbusiness.chron.com/reset-administrator-password-ibm-thinkpad-73098.html
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