POST code

POST code

Beberapa seri Motherboard lebih memilih menggunakan post code daripada beep code karena cakupan hardware yang di deteksi lebih luas.Dengan menggunakan metode ini tidak hanya komponen utama yang bisa dideteksi akan tetapi keyboard dan mouse pun bisa dideteksi.Pada generasi terdahulu post code ini dihasilkan menggunakan kartu tersendiri yang di sebut post card.Belakangan post card ini sudah terintegrasi pada motherboard.Berikut adalah seven segmen code atau sering disebut sebagai POST (Power On Self Test). Berikut beberapa contoh Post code dari beberapa BIOS yang di ambil dari www.bioscentral.com

POST code / seven segmen code pada beberapa BIOS

AMI BIOS Post Codes (After April 1990):

01	NMI is disabled and the i286 register test is about to start
02	i286 register test has passed
03	ROM BIOS checksum test (32KB from E8000h) passed OK
04	Passed keyboard controller test with and without mouse
05	Chipset initialized...DMA and interrupt controller disabled
06	Video system disabled and the system timer checks OK
07	8254 programmable interval timer initialized
08	Delta counter channel 2 initialization complete
09	Delta counter channel 1 initialization complete
0A	Delta counter channel 0 initialization complete
0B	Refresh started
0C	System timer started
0D	Refresh check OK
10	Ready to start 64KB base memory test
11	Address line test OK
12	64KB base memory test OK
15	ISA BIOS interrupt vectors initialized
17	Monochrome video mode OK
18	CGA color mode set OK
19	Attempting to pass control to video ROM at C0000h
1A	Returned from video ROM
1B	Shadow RAM enabled
1C	Display memory read/write test OK
1D	Alternate display memory read/write test OK
1E	Global equipment byte set for proper
1F	Ready to initialize video system
20	Finished setting video mode
21	ROM type 27256 verified
22	The power-on message is displayed
30	Ready to start the virtual mode memory test
31	Virtual memory mode test started
32	CPU has switched to virtual mode
33	Testing the memory address lines
34	Testing the memory address lines
35	Lower 1MB of RAM found
36	Memory size computation checks OK
37	Memory test in progress
38	Memory below 1MB is initialized
39	Memory above 1MB is initialized
3A	Memory size is displayed
3B	Ready to test the lower 1MB of RAM
3C	Memory test of lower 1MB OK
3D	Memory test above 1MB OK
3E	Ready to shutdown for real-mode testing
3F	Shutdown Ok - now in real mode
40	Cache memory now on...Ready to disable gate A 20
41	A20 line disabled successfully
42	i486 internal cache turned on
43	Ready to start DMA controller test
50	DMA page register test OK
51	Starting DMA controller 1 register test
52	DMA controller 1 test passed, starting DMA controller 2 register test
53	DMA controller 2 test passed
54	Ready to test latch on DMA controller 1 and 2
55	DMA controller 1 and 2 latch test OK
56	DMA controller 1 and 2 configured OK
57	8259 programmable interrupt controller initialized Ok
70	Start of keyboard test
71	Keyboard controller OK
72	Keyboard test OK...Starting mouse interface test
73	Keyboard and mouse global initialization OK
74	Display setup prompt.. Floppy setup ready to start
75	Floppy controller setup OK
76	hard disk setup ready to start
77	Hard disk controller setup OK
79	Ready to initialize timer data
7A	Timer data area initialized
7B	CMOS battery verified OK
7E	CMOS memory size updated
7F	Enable setup routine if <Delete> is pressed
80	Send control to adapter ROM at C800h to DE00h
81	Return from adapter ROM
82	Printer data initialization is OK
83	RS-232 data initialization is OK
84	80x87 check and test OK
85	Display any soft error message
86	Give control to ROM at E0000h
A0	Program the cache SRAM
A1	Check for external cache
A2	initialize EISA adapter card slots
A3	Test extended NMI in EISA system
00	Call the INT19 boot loader

AMI 2.2 BIOS:

00	Flag test; Testing of the CPU
03	Register test
06	Chipset test; System hardware initialized
09	BIOS checksum tested
0C	Page register tested
0F	8254 timer tested
12	Memory refresh initialization
15	8237 DMA controllers tested
18	8237 DMA initialization
1B	8259 PIC initialization
1E	8259 PIC chips tested
21	Memory refresh tested
24	Base 64 address tested
27	Base 64 memory tested
2A	8742 keyboard tested
2D	MC146818 RTC/CMOS
30	Protected mode started
33	Memory sizing test
36	First protected mode test passed
39	First protected mode test failed
3C	CPU speed calculation
3F	Read 8742 hardware switches
42	Initialize interrupt vector area
45	Verify CMOS configuration
48	Test and initialize video system
4B	Unexpected interrupt tested
4E	Start second protected mode test
51	Verify LDT instruction
54	Verify TR instruction
57	Verify LSL instruction
5A	Verify LAR instruction
5D	Verify VERR instruction
60	Address line A20 test
63	Unexpected exception tested
66	Start third protected mode test
69	Address line tested
6A	Scan DDNIL bits for null pattern
6C	System memory tested
6F	Shadow memory tested
72	Extended memory tested
75	Verify memory configuration
78	Display CMOS error messages
7B	Copy system BIOS shadow memory
7E	8254 clock tested
81	MC146818 RTC tested
84	Keyboard test
87	Determine keyboard type
8A	Stuck key test
8D	Initialize hardware Interrupt vectors
90	Math co-processor tested
93	Determine COM ports available
96	Determine LPT ports available
99	Initialize BIOS data area
9C	Fixed/floppy controller tested
9F	Floppy disk tested
A2	Fixed disk tested
A5	External ROM screen; Check for external ROM's
A8	System key lock test
AE	F1 error message test
AF	System boot initialization
B1	Call to Interrupt 19 boot loader