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Intel Motherboards:
T440BX
VC820

  • NCR PC6 (XT) BIOS Post Codes
  • NCR AT BIOS Post Codes
  • NCR PC916 BIOS Post Codes

 

NCR PC6 (XT) BIOS Post Codes:

AA 8088 CPU failure
B1 2764 EPROM checksum failure
B2 8237 DMA controller failure
B3 8253 PIT failure
B4 RAM failure
B5 8259 PIC failure
B6 RAM parity failure
BB All tests passed, ready to boot

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NCR AT BIOS Post Codes:

01 Test the CPU registers
02 Test system support I/O
03 Test BIOS ROM checksum
04 Test DMA page registers
05 Test timer channel 1
06 Test timer channel 2
07 Test RAM refresh logic
08 Test base 64KB
09 Test 8/16 bit bus conversion
0A Test interrupt controller 1
0B Test interrupt controller 2
0C Test I/O controller
0D Test CMOS RAM read/write operation
0E Test battery power
0F Test CMOS RAM checksum
10 Test CPU protected mode
11 Test video configuration
12 Test primary video controller
13 Test secondary video controller
20 Display results of tests to this point
21 Test DMA controller 1
22 Test DMA controller 2
23 Test system timer channel 0
24 Initialize interrupt controllers
25 Test interrupts
26 Test interrupts
30 Check base 640KB memory
31 Check extended memory size
32 Test higher 8 address lines
33 Test base memory
34 Test extended memory
40 Test keyboard
41 Test keyboard
42 Test keyboard
43 Test keyboard
44 Test A20 gate
50 Setup hardware interrupt vectors
51 Enable interrupt timer channel 0
52 Check BIOS ROM
60 Test floppy disk controller and drive
61 Test hard disk controller
62 Initialize floppy drives
63 Initialize hard drives
70 Test real time clock
71 Set time of day in RTC
72 Check parallel interface ports
73 Check serial interface ports
74 Check for any option ROM's
75 Check math coprocessor
76 Enable keyboard and RTC interrupts
F0 System not configured properly or hardware defect
F1 Scan and execute any option ROM's
F2 Call interrupt 19 boot loader

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NCR PC916 BIOS Post Codes:

01 Test CPU registers
03 Test BIOS ROM checksum
04 Test DMA page registers
05 Test timer channel 1
06 Test timer channel 2
0C Test 8042 keyboard controller
14 Test disabling speed stretch at port 69h
15 Start refresh timer 1
16 Enable speed stretch at port 69h
17 Clear write protect bit
1B Test 64KB shadow RAM
18 Write and test interrupt descriptor table
19 Verify RAM
02 Verify port 61h
07 Test refresh logic
08 Test base 64KB RAM
09 Test 8/16 bit bus conversion logic
0A Test interrupt mask register A
0B Test interrupt mask register B
1A Check 8042 keyboard controller
0D Test CMOS RAM shutdown byte
0E Test CMOS RAM battery power
0F Test CMOS RAM checksum
10 Test CPU protected mode
11 Test video configuration
12 Initialize and test primary video controller
13 Primary video error
20 Display results of tests to this point
21 Test DMA controller 1
22 Test DMA controller 2
23 Test timer 1 counter 0 840nS clock timer
27 Test timer 2 counter 0 for NMI
28 Test timer 2 counter
24 Initialize both interrupt controllers
25 Check for unexpected interrupts
26 Wait for interrupt
30 Check base 640KB memory
31 Check extended memory size
32 Test higher 8 address lines
33 Test base memory
34 Test extended memory up to 256MB
35 Test RAM in segment E000h
40 Test keyboard enable/disable
41 Test keyboard reset command
42 Test keyboard
43 Test keyboard
F4 Display speed setting
45 Initialize the mouse and enable IRQ 1
44 Test address overrun capability
50 Set up hardware interrupt vectors
51 Enable IRQ 0 interval interrupt from timer 0
60 Test for floppy and hard disk controllers and drives
61 Test disk controller
62 Initialize floppy drives
63 Initialize hard drives
74 Check and execute option ROM's from C8000h to DFFFFh
70 Test RTC
71 Set interval timer
72 Configure and test parallel interface
73 Configure and test serial interface
75 Test math coprocessor if installed
76 Enable keyboard and RTC
F0 Display and logged errors
F6 Test base memory
F3 Got to setup if F1 was pressed
F4 Display speed setting
F5 Initialize counter 2 for speed testing
F1 Test system code at E0000h and copy video ROM to shadow memory
F2 Call interrupt 19 boot loader
F6 Test base memory
F7 Test extended memory

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All information has been gathered with permission of the respective BIOS providers. Although Bios Central has used reasonable effort to ensure accuracy we are unable to verify all codes posted. Use at your own risk. Bios Central, or any person associated with Bios Central takes no responsibility for any dmage resulting from the use of this information.


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