Bios Post Codes - PC Engines ALIX.2 Series Manual

BIOS POST codes

tinyBIOS writes POST / diagnostic codes to port 80h. To make these codes visible, use a miniPCI
POST card such as PC Engines POST.5A. POST codes are:
01 reset entry
02 chipset initialization
03 detect base memory size
04 initialize shadow RAM
05 init mono video
06 disable PCI devices
07 test low 64KB of DRAM
08 initialize stack
09 BIOS checksum
0a super I/O initialization
0b RTC test
0c refresh / 8254 test
0d speed-dependent chipset regs
0e test 8237 DMA
0f test DMA page registers
10 test 8254 registers
11 test keyboard controller
12 init timer, DMA, 8259...
13 test 8259 mask registers
14 test low 640KB
15 init vectors
16 PCI plug & play
17 shadow video BIOS
18 look for VGA BIOS
19 sign-on prompt
1a second keyboard test
1b extended memory test
1c enable interrupts
1d test / init RTC
1e init floppy disk
1f option ROM scan
20 test parallel ports
21 test serial ports
22 enable coprocessor
23 floppy init
24 hard disk init
25 PS/2 mouse detect
26 timer/RTC check
27 OEM boot decision point
00 boot
33 NMI
F7 low 64KB memory test failed
ALIX system board 21 5/5/2010