Computer port adapters

Adapting an old keyboard

A PS/2 keyboard with a Mini-DIN plug needs a matching socket on the adapter. The other end must mate with the computer’s AT port. Starting with an AT keyboard reverses those requirements. Compare the actual pin arrangement as well as the diameter of the round shell.

Changing serial connections

With a DB9 serial connection, a gender changer and a null modem adapter can both solve a physical mismatch. Only the part with the required internal wiring will pass the intended signals. Compare the equipment manual’s pinout with the adapter description before adding an extension for extra reach.

Give a mixed adapter drawer a simple inventory

On a shared repair bench, a useful label describes what was connected at both ends when the adapter worked. “Old keyboard to tower” gives more context than “round adapter.” For serial equipment, add the machine model, part number and the wiring type confirmed in its documentation. Keep a clear photo of each mating face, since the same product can look reversed when turned over in a listing photo. If you are ordering a spare for an installation you cannot visit, ask for those two photos and the text on the existing adapter before selecting the replacement.

Can a desktop read this old notebook drive?

Pull up the model number printed on the drive before searching for an adapter. A 2.5-inch drive can use several interfaces. The 3250-03500 specifically adapts a 44-pin notebook IDE/PATA drive to a 40-pin desktop IDE/PATA connection. Read the drive's connection and power instructions and check what the desktop controller supports. If the desktop only exposes SATA or USB, this connector change alone leaves a missing interface. Draw the entire route from the drive to the host before purchasing. For an old disk that contains important files, decide where the first copy will go before reconnecting it.

Can the adapter stay on the machine during transport?

A small rigid adapter can add enough length to a rear port that the equipment no longer fits its carrying case. Measure from the equipment panel to the inside of the case lid and allow room for the cable exit. Try packing the machine with it disconnected and see whether a labeled storage pocket is more practical. For a demonstration unit that gets moved weekly, a short flexible adapter lead may also change where the weight of the cable rests. Check that any alternative has the same connector pair and supported function before making that mechanical change. A better physical fit is useful only if the peripheral will still communicate.

Compare parts for your setup

Related Atlas guides

• Troubleshoot a USB-C to HDMI adapter with no picture

Technical references

• NI guide to straight-through and null modem cables