STEP 1 : Purchase/Collect The Components

STEP 10 : Install the I/O Connectors & Mouse

Now that the motherboard is in place, you can start connecting all the parts of the computer to it. The first step is to install the I/O connectors, such as your parallel and serial ports.
Note that if you are installing an ATX motherboard, these connectors are built into the motherboard, and you do not have to do this step.

Study the setup and determine mounting technique. AT style boards almost always come with slot inserts that have the parallel and serial ports mounted on them. These are just screwed onto a couple of your expansion slot bays on the back of the case. While this is easy, it steals the slots away from the motherboard slots, keeping you from using those slots later for expansion cards. To get around tying up these slots, you can remove the actual ports from the metal plate and install them into the dedicated port holes on the back of the case, if your case has them. These holes are located above the regular card slot bays and are usually covered with a metal cap that will need to be pried out with a screwdriver.

If you are installing ports on the metal insert, you can now screw these inserts into one of the available slots on the back of the case. It is best to choose a slot near the top that will not be used for anything else and provides a short enough distance so that the I/O cables can reach the motherboard.
If you are installing the ports into the dedicated slots on the case, you should now choose which slots you will use, making sure you choose those that fit your I/O ports, such as 9-pin or 25-pin. Then remove the cover from these slots. Some cases hold these covers on with a screw. With others, the cover is a metal punch, where you can remove it with a screwdriver and bending it until it snaps off.
If the ports are installed in a metal insert, un-install them now. Then install them into the appropriate case slot. You can tighten them in with hexagonal nuts, just like those used on the metal insert.
Either way you installed the ports, they are installed now. All you need to do is connect them to the motherboard. Using the board's manual, determine which connectors are for the ports, usually labeled PRNT, for printer or LPT1, then COM1 and COM2. Most likely, the 9-pin connector connects to the COM 1 connector on the motherboard. Pay attention to pin 1 on the connectors. Make sure the red side of the ribbon cable is lined up with pin 1.

If you are using a serial mouse, it will simply plug into the 9-pin connector you just installed. If you will be using a PS/2 mouse with this system, then this connector is attached the same way. Install the insert near the PS/2 connector on the motherboard. Then connect the PS/2 cable to the connector, usually consisting of a few pins sticking straight up off the board.

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