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E-2 Service Guide
Table E-1 POST Checkpoint List
Checkpoint Description
24h
• Tests programmable interrupt controller (8259)
• Initializes system interrupt
30h
• Enables system shadow RAM
34h
• Memory sizing
5Ah
• Changes SMBASE, copy SMI Handler.
•
56h
• Issues 1st software SMI to communicate with PMU.
• Initializes the SMI environment.
3Fh
• Enable/Disable USB function
3Ch
• Initializes interrupt vectors
3Eh
• Set fixed CMOS setting
4Ch
• CPU clock checking
• Sets the DRAM timing in correspondent to the system speed
35h
• Scans PCI Devices to Initialize the PCI buffer that used by BIOS.
4Eh
• Isolations for PnP ISA Card
4Fh
• Configurations for PnP ISA Card
• Initializes the PCI device according to ESCD data (if ESCD data is valid).
• Initialize the PCI Devices by BIOS
• Initialize the PCI VGA card
50h
• Initializes video display
Note: If system has any display card, here it should be initialized via its I/O ROM or
corresponding initialization program.
Exh
• VGA BIOS POST.
54h
• Enables video shadow RAM
58h
• Displays Acer (or OEM) logo (if necessary)
• Displays Acer copyright message (if necessary)
• Displays BIOS serial number
5Ch
• Memory testing
5Eh
• Assign PCMCIA resource, enable serial IRQ
60h
• External Cache sizing
• Enables/disables L1/L2 cache according to the BIOS SETUP
64h
• Tests keyboard interface
Note: The keyboard LEDs should flash once.
68h
• Enables UIE, then checks RTC update cycle
Note: The RTC executes an update cycle per second. When the UIE is set, an
interrupt (IRQ8) occurs after every update cycle and indicates that over 999ms
are available to read valid time and date information.
70h
• Parallel port testing