Acer 390 Series Service Manual page 203

Table E-1 POST Checkpoint List
Checkpoint
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
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
E-2
Description
Service Guide