Acer Power SP Technical Information PDF herunterladen (Seite 52)

46 Chapter 4

Power-On Self-Test (POST)

Each time you turn on the system, the Power-on Self Test (POST) is initiated. Several items are tested during

POST, but is for the most part transparent to the user.

The Power-On Self Test (POST) is a BIOS procedure that boots the system, initializes and diagnoses the

system components, and controls the operation of the power-on password option. If POST discovers errors in

system operations at power-on, it displays error messages on screen, generates a check point code at port

80h or even halts the system if the error is fatal.

The main components on the main board that must be diagnosed and/or initialized by POST to ensure system

functionality are as follows:

T Microprocessor with built-in numeric co-processor and cache memory subsystem

T Direct Memory Access (DMA) controller

T Interrupt system

T Three programmable timers

T ROM subsystem

T RAM subsystem

T RTC RAM subsystem and real time clock/calendar with battery backup

T Onboard serial interface controller

T Onboard parallel interface controller

T Embedded hard disk interface and one diskette drive interface

T Keyboard and auxiliary device controllers

T I/O ports

T PS/2-compatible mouse port

T PS/2-compatible keyboard port

T Serial ports

T Parallel ports

T USB port

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Acer Power SP Technical Information Seite 52