Acer R310-U-P3200 User Guide - Page 37

Initialize MultiBoot. Allocate memory for, Enable USB devices. - max memory

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27 Checkpoint Code Beep Code 49h 4Ah 4Bh 4Ch 4Eh 4Fh 50h 51h 52h 54h 55h Description 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. Initialize all video adapters in system. 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. Shadow video BIOS ROM if specified by Setup, and CMOS is valid and the previous boot was OK. Display copyright notice. Initialize MultiBoot. Allocate memory for old and new MultiBoot history tables. Display CPU type and speed. Checksum CMOS and initialize each EISA slot with data from the initialization data block. Verify keyboard reset. Initialize keystroke clicker if not enabled in Setup. Enable USB devices.

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27
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 inter-
rupts 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.
4Eh
Display copyright notice.
4Fh
Initialize MultiBoot. Allocate memory for
old and new MultiBoot history tables.
50h
Display CPU type and speed.
51h
Checksum CMOS and initialize each EISA
slot with data from the initialization data
block.
52h
Verify keyboard reset.
54h
Initialize keystroke clicker if not enabled in
Setup.
55h
Enable USB devices.
Checkpoint
Code
Beep Code
Description