Everything you wanted to know about a motherboard – IV

Trusted Platform Module: The TPM is a microcontroller device installed on the motherboard that stores encryption keys, passwords, and digital certificates. It provides secure key generation that can be used to create and/or store both user and platform identity credentials for authentication.
· Offers improved, hardware based security
· Uses RSA and SHA-1 encryption algorithms to create an encryption key for a specific computer
· Encryption keys can be used for full-disk encryption, software licensing, and digital rights management
Power Supply: The computer’s power supply powers all internal components. Power supplies come in different wattage models ranging from 63.5 to 1000-plus watts. Each unit contains a power transformer that converts voltage from the wall socket to the power level the computer can safely use. The unit transmits a power good signal to the motherboard. This signal must be present continuously for the computer to run. If it is not, the computer shuts down instantly.
The power good signal performs several functions:
· Prevents the computer from starting until the appropriate level of operating voltage is reached
· Interfaces with the computer’s reset switch. When the reset switch is pressed, the power good signal is grounded out. When the switch is released, the power good resumes and the system reboots.

When comparing the ATX and the AT power supplies, the main plugs from the power supply to the motherboard are very different. The ATX has a single, form-fitted plastic plug that fits into an on-board socket that has a unique configuration. The plug is form fitted so that it will only fit into the socket in one direction.

ATX On-Board Power Socket (front view)

In contrast, the AT power supply has two separate plugs that fit into two separate on-board sockets. The wires on the plugs are color-coded. To make the correct connection, be sure to place the plugs into the sockets with the black wires of both plugs located directly next to each other. When properly connected, these black wires will be in the center of the two seated plugs.




AT Power Supply Socket (2 cords required)







Warning: Unlike the form-fitted ATX plug, the AT plugs can be connected incorrectly. If the AT plugs are not connected correctly, the motherboard will fail and a fire may occur.