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E-2 Service Guide
Table E-1 POST Checkpoint List (Continued)
Checkpoint Description
2Ch • 128K base memory testing
• Set default SS:SP= 0:400
Note: The 128K base memory area is tested for POST execution. The remaining
memory area is tested later.
20h • KB controller(8041/8042) testing
• KB type determination
• Write default command byte upon KB type
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
51h • DownLoad keyboard matrix
50h • Initialize Video display
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
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.