• Landmark Jumpstart XT BIOS Post Codes
• Landmark Jumpstart AT BIOS Post Codes
• Landmark Supersoft AT BIOS Post Codes

 

Landmark Jumpstart XT BIOS Post Codes:

01	Jump to reset area in BIOS ROM
02	Initialize DMA page register
03	Initialize DMA refresh register
04	Clear all RAM
05	Perform RAM test on first 64KB
06	Clear first 64KB
07	Initialize BIOS stack to 0FC0h
08	Set the equipment flag based on XT switches
09	Initialize default-interrupt vectors
0A	Initialize the 8255 parallel interface, if it exists
0B	Initialize the 8259 PIT and enable interrupts
0C	Setup adapters and peripherals
0D	Setup video system
0E	Initialize the video system
0F	Initialize the equipment
10	Initialize memory configuration
11	Setup system timer function
12	Initialize system timer
13	Setup time-of-day function
14	Initialize time of day from RTC data
15	Setup and initialize "print screen" function
16	Setup and initialize cassette interface, if available
17	Setup and initialize bootstrap function
18	Setup and initialize keyboard function
19	Enable speaker
1A	Setup system timer
1B	Enable the RTC
1C	Setup timer 2
1D	Determine memory size; write 55Aa/AA55 to first and last word in segment
1E	Read first and last word of segment
1F	Compare first and last words
20	Report found memory size of segment
21	Perform BIOS ROM checksum test
22	Perform complete RAM testing on cold boot
23	Move system stack to bottom of memory and save pointer 40:0E
24	Reset parity after RAM sizing
25	Enable timer and keyboard interrupts
26	Setup the serial and parallel ports
27	Setup the game port
28	Setup the floppy-disk controller
29	Scan for optional ROM's in 2KB chucks from C8000h
2A	Call the boot loader

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Landmark Jumpstart XT BIOS Post Codes:

03	Sound one short beep
04	Initialize the bell tone
05	Enable CMOS RAM
06	Reset video controller
07	Disable parity checking
08	Start memory refresh
09	Clear the reset flag in RAM
0A	Test DMA page registers
10	Use CMOS to determine if a soft reset has occurred
11	Check BIOS ROM checksum
12	Test system timer A
13	Test DMA channel 0
14	Test DMA channel 1
15	Test memory refresh
16	Flush 8042 keyboard controller input buffer
17	Reset 8042 keyboard controller
18	Get keyboard type
19	Initialize the keyboard
1A	Clear any existing parity
1B	Enable on-board parity
1C	Test base 64KB memory
1D	Test base 64K parity
1E	Initialize POST stack
20	Check keyboard type
21	Test protected mode CPU registers
22	Initialize 8259 programmable interrupt controller
23	Initialize all interrupts
24	Test all interrupts
25	Perform DRAM checksum
26	Adjust configuration based on hardware found and CMOS settings
27	Check for presence of manufacturing switch
28	Initialize video controller
2A	Test video memory
2B	Test video sync
2C	Check for auxiliary video controller
2D	Change video configuration
2F	Initialize the video system
30	Change video interrupt
31	Display any POST messages
32	Test memory and calculate size
33	Adjust memory configuration
34	Enable I/O parity
35	Test 8259 programmable interrupt controller
36	perform byte-swap test
37	Test NMI
38	Perform timer test
39	Initialize system timer A
3A	Protected mode memory test
3B	Test keyboard
3C	Test keyboard interrupt
3D	Enable A20
3E	Reset hard disk controller
3F	Setup floppy disk controller
40	Test floppy drive system
41	Setup keyboard
42	Enable interrupt timer
43	Check for dual floppy disk/hard disk controller
44	Locate floppy drive A
45	Locate floppy drive B
46	reset hard disk controller
47	Enable slave DMA
48	Locate any external ROM's
49	Initialize the parallel ports
4A	Initialize the serial ports
4B	Initialize the math coprocessor
4C	Read CMOS RAM status
4D	Check CMOS configuration against detected hardware
4E	Initialize timer ticks
4F	Enable IRQ9
50	Enable on-board parity
51	Run any add-on ROM's
52	Enable keyboard interrupt
53	Reset the parallel port
60	Check for any errors
61	Sound one short beep
62	Print sign-on message
64	Call interrupt 19 boot loader

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Landmark Supersoft AT BIOS Post Codes:

11	CPU register or logic error
12	ROMPOST A checksum error
13	ROMPOST B checksum error
14	8253 programmable interrupt timer channel 0
15	8253 programmable interrupt timer channel 1
16	8253 programmable interrupt timer channel 2
17	8237 DMA controller 1 error
18	8237 DMA controller 2 error
19	DMA page register error
1A	8042 keyboard controller error
21	Scan 16KB critical RAM error
22	Memory refresh error
23	CPU protected mode error
24	8259 interrupt controller 1 error
25	8259 interrupt controller 2 error
26	Unexpected interrupt detect
27	Interrupt 0, system timer, error
28	CMOS RTC error
29	NMI error
2A	Locate and test math coprocessor
31	Keyboard controller error
32	Stuck key detected or CMOS RAM error
33	Floppy controller error
34	Floppy disk read error
35	MDA video memory error
36	Color video memory error
37	EGA/VGA RAM error
38	BIOS ROM checksum error
41	Memory error
42	Refresh fault
43	Display problem
44	Display problem
45	Display problem
59	No monitor detected

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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.