The main connector is a Molex 39-01-2200 or equivalent 20-pin housing with square and round pins.

"Come on," he whispered. The power supply was in standby mode. He knew how these old proprietary units worked; they required a specific handshake—a "remote on" signal—to actually bridge the circuit and push the heavy current. He had to trick the brick into thinking it was plugged into its original system. ⚡ The Spark of Life

Are you planning to use this for a specific project, like an or a DIY 12V power source ? Dell D220P-01 Power Supply Pinout Guide | PDF - Scribd

Most power supplies were standard. ATX. AT. Easy. But Dell, in their infinite wisdom in the early 2000s, had decided to rewire the universe. The first pinout he found was for the D220P-00. It didn't match. The colors were different. The gray 'Power Good' wire was in the wrong house.

To use this PSU outside a Dell motherboard:

| Symptom | Likely Cause | Fix | |---------|--------------|-----| | No power, fan doesn’t spin | PS_ON not shorted (pin 8) | Short green to black | | PSU shuts down after 1 sec | No load on +5V | Add 5V load (HDD/resistor) | | 3.3V reads 2.7V | Brown sense line open | Tie brown (pin 18) to any orange (+3.3V) | | PC restarts randomly | PW-OK (gray) unstable | Check caps; replace if bulging (common on D220P-01) |