C-2 Service Guide
Table C-1 POST Checkpoint List
Checkpoint Description
24h
• PIC(8259) testing & initialization
30h
• System Shadow RAM
34h
• DRAM sizing
3Ch
• Initialize interrupt vectors
4Bh
• Identify CPU brand and type
35h
• PCI pass 0
40h
• Assign I/O if device request
41h
• Assign Memory if device requested
44h
• Assign IRQ if device request
45h
• Enable command byte if device is OK
50h
• Initialize Video display
52h
• Download keyboard matrix
4Ch
• ChipUp initialization for CPU clock checking
54h
• Process VGA shadow region
58h
• Set POST screen mode(Graphic or Text)
• Display Acer(or OEM) logo if necessary
• Display Acer copyright message if necessary
• Display BIOS serial number
59h
• Hook int vector 1ch for POST quiet boot
5Ch
• Memory testing
5Ah
• SMRAM test and SMI handler initialization
4Eh
• Audio initialization
60h
• External Cache sizing
• External Cache testing(SRAM & Controller)
• Enable internal cache if necessary
• Enable external cache if necessary
64h
• Reset KB device
• Check KB status
Note:
The keyboard LEDs should flash once.
7Ch
• Reset pointing device
• Check pointing device
70h
• Parallel port testing
74h
• Serial port testing
78h
• Math Coprocessor testing
80h
• Set security status
84h
• KB device initialization
• Enable KB device
