DB (D-Sub) Connectors and COM Ports A serial port on a PC is a male 9-pin connector (DE-9 D-sub). Early PCs had two 9-pin connectors or one 9-pin and one 25-pin (DB-25).

The adapter lets you connect your keyboard into a 9-pin serial port connector. With the adapter, you keyboard gets its power from the serial port, although that may not be enough to power the NumLock ...

And if you were to go back a few more years into the past, you’d have found when you bought a mouse with a PS/2 connector fitted, it may well have come with an adapter for a 9-pin RS232 serial port.

It was MacOS X vs. Win XP. Anyway, the serial port on my Inspiron 8000 is very usefull. Note, the Inspiron 8000 has a 4 pin S400 1394 port, but I have never used it before.

This was done using a 9-pin outlet on one computer connected to another computer through a null modem: a special, RS-232 serial cable that enabled communication programs to transfer files and data ...

Most desktop PCs have a nine-pin serial port, but laptops don't always have this port. Plug the RJ-45 rollover cable connector into a DB-9 (female) Terminal adapter and then plug the adapter into ...

Why is this necessary? The connector on the classic Mac mouse may look like a familiar DE-9 connector, but it is not an RS-232 device and wouldn’t work if it were plugged into a 9-pin serial port.

As you can see in the shot above, the $59 RS-232 serial cable has the iPod dock connector on one end and the male DB-9 connector on the other. Actually, we first spotted it at Macworld in January ...