Acer Altos R310, Руководство по обслуживанию

Страница: 61 / 97

55 Altos R310
33h Initialize the Phoenix Dispatch Manager.
34h 1-4-2-1 CMOS test.
36h Vector to proper shutdown routine.
38h Shadow the system BIOS.
3Ah Autosize external cache and program cache
size for enabling later in POST.
3Ch
If CMOS is valid, load chipset registers with values
from CMOS, otherwise load defaults and display
Setup prompt. If Auto Configu-ration is enabled,
always load the chipset registers with the Setup
defaults.
3Dh Load alternate registers with CMOS values.
Register-table pointers are in the altreg-table
segment.
41h Initialize extended memory for RomPilot.
42h Initialize interrupt vectors 0 thru 77h to the BIOS
general interrupt handler.
45h Initialize all motherboard devices.
46h 2-1-2-3 Verify the ROM copyright notice
47h Initialize support for I2O by initializing glo-bal
variables used by the I2O code. Pause POST table
processing if a CMOS bit is set (for debugging).
48h Verify that the equipment specified in the CMOS
matches the hardware currently installed. If the
monitor type is set to 00 then a video ROM must
exist. If the monitor type is 1 or 2 set the video switch
to CGA. If monitor type 3, set the video switch to
mono. Also specify in the equipment bytethat disk
drives are installed. Set appropri-ate status bits in
CMOS or the BDA if configuration errors are found.
49h Perform these tasks:
1. Size the PCI bus topology and set bridge bus
numbers
2. Set the system max bus number
3. Write a 0 to the command register of every PCI
device
4. Write a 0 to all 6 base registers in every PCI
device
5. Write a -1 to the status register of every
PCI device
6. Find all IOPs and initialize them.
4Ah Initialize all video adapters in system.
4Bh Initialize QuietBoot if it is installed. Enable
both keyboard and timer interrupts (IRQ0 and IRQ1).
If your POST tasks require interrupts off, preserve
them with a PUSHF and CLI at the beginning and a
POPF at the end. If you change the PIC, preserve
the existing bits.
4Ch Shadow video BIOS ROM if specified by Setup, and
CMOS is valid and the previous boot was OK.
Checkpoint Code Beep Code Description