Acer AcerPower Sx Acer Power SX/SXb/SC Service Guide - Page 74

Check Point 35H 4EH 4FH 40H 41H 42H 44H 45H 50H 51H 54H 4CH 58H 59H 64H 5CH 5EH 5AH 5FH 60H 70H 74H 78H 7CH 80H 82H 84H 6CH 88H 90H 93H 94H 96H A0H A4H A2H A8H Description PCI pass 0 Scan PnP Devices Config PnP Devices Initial PCI (1) Initial PCI (2) Initial PCI (3) Initial PCI (4) Initial PCI (5) Initializes video display NOTE: If system has any display card, it should be initialized via its I/O ROM or corresponding initialization program. Copy F-seg from ROM into shadow RAM Process VGA shadow region Check CPU brand, ID and external frequency 1. Displays Acer (or OEM) logo (if necessary) 2. Displays Acer copyright message (if necessary). 3. Displays BIOS serial number. Hook INT 1CH for Quiet Boot. Tests keyboard interface NOTE: The keyboard LEDs should flash once. Memory test (except the 384K base memory) Load Pentium Pro CPU update code Test SM RAM Enables/Disables USB Function 1. Initializes SRAM cache capacity 2. Enables the cache function Initializes parallel port(s) Initializes parallel port(s) Reset math coprocessor Check and initialize pointing device Set security status Prepare entering SETUP for user pressing CTRL + ALT DEL. Keyboard device initialization 1. Tests and initializes FDD 2. The FDD LED should flash once and its head should be positioned 1. Sets HDD type and features (i.e. transfer speed, mode,....) 2. Tests HDD controller Displays POST status Rehook INT 1CH for Quiet Boot 1. Initializes I/O ROM 2. I/O ROM is an optional extension of the BIOS located on an installed add-on card as part of the I/O subsystem. POSt detects I/O ROMs and gives them opportunity to initialize themselves and their hardware environment. Initializes PCI I/O ROM Sets time and day Initializes security features Initializes setup items Setup SMI parameters 66 Chapter 4