Finding a Dell CT109 serial-to-PS/2 cable can be a real challenge these days. These cables were specifically designed for older Dell systems and are now quite rare. But don't despair! This guide will walk you through how to create your own, saving you time and money. This is a DIY project, so proceed with caution and at your own risk. Improper wiring can damage your equipment.
Understanding the Connections
Before we begin, it's crucial to understand the pinouts of both the serial (DB9) and PS/2 connectors. The Dell CT109 cable wasn't a standard conversion; it likely had a specific wiring scheme. While we can't guarantee an exact replica, we can create a functional cable for many situations. This focuses on keyboard functionality. Mouse connections are more complex and will require advanced knowledge.
Here's a simplified overview:
- DB9 (Serial Port): This 9-pin connector on your computer's serial port transmits data using RS-232 signaling.
- Mini-DIN 6 (PS/2): This 6-pin connector is used for PS/2 keyboards and mice. We'll focus on keyboard connections here.
Gathering Your Materials
To build your custom cable, you will need:
- DB9 Male Connector: Find one that's designed for soldering.
- Mini-DIN 6 Female Connector (PS/2): Again, ensure it's solderable.
- Appropriate Gauge Wire: Use stranded wire for flexibility. 24-28 AWG is generally suitable.
- Soldering Iron & Solder: Essential for creating the connections.
- Wire Strippers/Cutters: For preparing the wires.
- Multimeter (Optional): Helps verify connections before testing.
- Heat Shrink Tubing (Optional): Provides insulation and strain relief.
Wiring the Cable: A Simplified Approach (Keyboard Only)
This is a simplified wiring scheme for keyboard functionality. It might not replicate the exact Dell CT109's behavior in all situations but offers a functional solution for many older Dell systems.
Note: This uses a common, but not universally guaranteed, mapping. Experimentation might be necessary. Always double-check the pinouts of your specific computer's serial port and the PS/2 keyboard before proceeding.
| DB9 Pin | PS/2 Pin | Wire Color Suggestion | Function |
|---|---|---|---|
| 2 (TXD) | 1 | Green | Data + |
| 3 (RXD) | 2 | White | Data - |
| 5 (GND) | 5 | Black | Ground |
Important Considerations:
- Ground (GND): This is crucial for proper functionality. Make sure your ground connection is secure.
- Signal Integrity: Keep your wire runs neat and organized to minimize signal interference.
- Testing: Test the cable thoroughly after soldering. A faulty connection can damage your hardware.
Step-by-Step Instructions
- Prepare the Wires: Cut and strip the appropriate lengths of wire.
- Solder the Connections: Carefully solder each wire to the corresponding pins on both the DB9 male and Mini-DIN 6 female connectors. Double-check your wiring against the table above.
- Insulate the Connections: Use heat shrink tubing (if you have it) to insulate and protect the soldered joints.
- Assemble the Cable: Neatly bundle and secure the wires. You can use cable ties for a professional look.
- Test the Cable: Connect the cable to your computer's serial port and the PS/2 keyboard. Try typing to see if it works.
Troubleshooting
If the keyboard doesn't work, double-check your wiring. A multimeter can help verify connectivity. If you're still having issues, consider the following:
- BIOS Settings: Ensure your BIOS is configured to support the PS/2 keyboard through the serial port. This is rare, but possible.
- Compatibility: The specific wiring might not be compatible with all systems. Further research into the Dell CT109 might be needed.
This guide offers a starting point for creating a Dell CT109-like cable. Remember, this is a complex task, and incorrect wiring can damage your computer. If you are uncomfortable with soldering and electronics, seek professional help. Use caution, and always prioritize the safety of your equipment.
