• Olivetti 1076/AT&T BIOS Post Codes
• Olivetti M20 BIOS Post Codes
• Olivetti M24/AT&T BIOS Post Codes
• Olivetti PS/2 BIOS Post Codes

 

Olivetti 1076/AT&T BIOS Post Codes:

PASS	FAIL	DESCRIPTION
41	7F	CPU flag and register test
42	7E	Check and verify CMOS shutdown code
43	7D	BIOS ROM checksum test
44	7C	Test the 8253 timer
45	7B	Start memory refresh
46	7A	Test the 8041 keyboard controller
47	79	Test the first 8KB of RAM
48	78	Test protected mode operation
49	77	Test CMOS RAM shutdown byte
4A	76	Test protected mod operation
4B	75	Test RAM from 8KB to 640KB
4C	74	Test all RAM above 1MB
4D	73	Test NMI
4E	72	Test RAM parity system
50	71	Test 8259 PIC 1
51	6F	test 8259 PIC 2
52	6E	Test DMA page register
53	6D	Test 8237 DMA controller 1
54	6C	Test 8237 DMA controller 2
55	6B	Test PIO port 61h
56	6A	Test the keyboard controller
57	69	Test the CMOS clock/calendar IC
59	68	Test the CPU protected mode
5A	66	Test CMOS RAM battery
5B	65	Test CMOS RAM
5C	64	Verify CMOS RAM checksum
5D	63	Test parallel port configuration
5E	62	Test serial port configuration
5F	61	Test memory configuration below 640KB
60	60	Test memory configuration above 1MB
61	5F	Detect and test math coprocessor
62	5E	Test configuration of game port adapter
62	5D	Test key lock switch
63	5D	Test hard drive configuration
64	5C	Configure floppy drives
66	5B	Test option ROM's
-	-	Call interrupt 19 boot loader

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Olivetti M20 BIOS Post Codes:

Triangle	Test CPU registers and instructions
Triangle	Test system RAM
4 vertical lines	Test CPU call and trap instructions
Diamond	Initialize screen and printer drivers
EC0	8255 parallel interface IC test failed
EC1	6845 CRT controller IC test failed
EC2	1797 floppy disk controller chip failed
EC3	8253 timer IC failed
EC4	8251 keyboard interface failed
EC5	8251 keyboard test failed
EC6	8259 PIC IC test failed
EK0	Keyboard did not respond
Ek1	Keyboard responds, but self test failed
ED1	Disk drive 1 test failed
ED0	Disk drive 0 test failed
E10	Non-vectored interrupt error
E11	Vectored interrupt error

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Olivetti M24/AT&T BIOS Post Codes:

40	CPU flags and register test failed
41	BIOS ROM checksum test failed
42	Disable 8253 timer channel 1
43	8237 DMA controller test failed
44	8259 PIC test failed
45	Install the real interrupt vectors
48	Send beep and initialize all basic hardware

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Olivetti PS/2 BIOS Post Codes:

01	Test CPU
02	Check CMOS shutdown byte
03	Initialize the PIC
04	Test refresh
05	Test CMOS/RTC periodic interrupt
06	Test timer ratio
07	Test first 64KB of RAM
08	Test 8042 keyboard controller
09	Test NMI
0A	Test 8254 PIT
0B	Test port 94h
0C	Test port 103h
0D	Test port 102h
0E	Test port 96h
0F	Test port 107h
10	Blank the display
11	Check the keyboard
12	Test CMOS RAM battery
13	Verify CMOS RAM checksum
14	Verify extended CMOS RAM checksum
15	Initialize system board and adapter
16	Initialize and test RAM
17	Test protected mode registers
18	Test CMOS RAM shutdown byte
19	Test CMOS protected mode
1A	Initialize video adapter ROM scan
1B	Test BIOS ROM checksum
1C	Test PIC #1
1D	Test PIC #2
1E	Initialize interrupt vectors
1F	Test CMOS RAM
20	Test extended CMOS RAM
21	Test CMOS real-time clock
22	Test clock calendar
23	Dummy checkpoint
24	Test watchdog timer
25	Test 64KB to 640KB RAM
26	Configure lower 640KB RAM
27	Test extended memory
28	Initialize extended BIOS data segment and log POST error
29	Configure memory above 1MB
2A	Dummy checkpoint
2B	Test RAM parity
2C	Test DMA page registers
2D	Test DMA controller registers
2E	Test DMA transfer-count register
2F	Initialize DMA controller
30	Test PIO 61
31	Test the keyboard
32	Initialize keyboard typematic rate and delay
33	Test auxiliary device
34	Test advanced protected mode
35	Configure parallel ports
36	Configure 8250 serial ports
37	Test and configure math co-processor
38	Test and configure game-port adapter
39	Configure and initialize hard disk
3A	Floppy-disk configuration
3B	Initialize ROM drivers
3C	Display total memory and hard drives
3D	Final initialization
3E	Detect and initialize parallel ports
3F	Initialize hard drive and controller
40	Initialize math co-processor
42	Initialize adapter ROM scan
CC	Unexpected processor excerption occurred
DD	Save DDNIL status
EE	NMI handler shutdown
FF	Call interrupt 19 boot loader

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