BIOS Quick Reference • CC5-RAVE
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EKF Elektronik GmbH * Philipp-Reis-Str. 4 * D-59065 HAMM (Germany)
Tel. +49 (0)2381/6890-0 * Fax. +49 (0)2381/6890-90 * E-Mail [email protected] * Internet http://www.ekf.de
POST_STATUS_RESETID 0a0h KB ID flag reset.
POST_STATUS_TESTCACHE 0a1h Test cache memory.
POST_STATUS_DISPSOFTERR 0a2h Display soft errors.
POST_STATUS_TYPEMATIC 0a3h Set keyboard typematic rate.
POST_STATUS_MEMWAIT 0a4h Program memory wait states.
POST_STATUS_CLRSCR 0a5h Clear screen.
POST_STATUS_ENABPTYNMI 0a6h Enable parity and NMIs.
POST_STATUS_INITE000 0a7h Initialize before calling ROM at E000h.
POST_STATUS_CALLE000 0a8h Call ROM BIOS extension at E000h.
POST_STATUS_POSTE000 0a9h ROM extension returned.
POST_STATUS_DISPCONFIG 0b0h Display system configuration box.
POST_STATUS_INT19BOOT 00h Call INT 19h bootstrap loader.
POST_STATUS_LOWMEMEXH 0b1h Test low memory exhaustively.
POST_STATUS_EXTMEMEXH 0b2h Test extended memory exhaustively.
POST_STATUS_PCIENUM 0b3h Enumerate PCI buses.
Addendum B: Embedded BIOS Beep & Blink Codes
Embedded BIOS tests much of the system hardware early in POST before messages can be
displayed on the screen. When system failures are encountered at these early stages, POST uses
beep codes (a sequence of tones on the speaker) and blinking sequences (visual signals, output
to the floppy drive LED) to identify the source of the error. The following is a comprehensive list
of POST beep & blink codes for the system BIOS. BIOS extensions, such as VGA ROMs and SCSI
adapter ROMs, may use their own beep codes, including short/long sequences, or possibly beep
codes that sound like the ones below. When diagnosing a system failure, remove these adapters
if possible before making a final determination of the actual POST test that failed.
Mnemonic Code
Beep Count
Description of Problem
POST_BEEP_REFRESH
1
Memory refresh is not working
POST_BEEP_PARITY
2
Parity error found in 1st 64KB of memory
POST_BEEP_BASE64KB
3
Memory test of 1st 64KB failed
POST_BEEP_TIMER
4
T1 timer test failed
POST_BEEP_CPU
5
CPU test failed
POST_BEEP_GATEA20
6
Gate A20 test failed
POST_BEEP_DMA
7
DMA page/base register test failed
POST_BEEP_VIDEO
8
Video controller test failed
POST_BEEP_KEYBOARD
9
Keyboard test failed
POST_BEEP_SHUTDOWN
10
CMOS shutdown register test failed
POST_BEEP_CACHE
11
External cache test failed
POST_BEEP_BOARD
12
General board initialization failed
POST_BEEP_LOWMEM
13
Exhaustive low memory test failed
POST_BEEP_EXTMEM
14
Exhaustive extended memory test failed
POST_BEEP_CMOS
15
CMOS restart byte test failed
POST_BEEP_ADDRESS_LINE
16
Address line test failed
POST_BEEP_DATA_LINE
17
Data line test failed
POST_BEEP_INTERRUPT
18
Interrupt controller test failed
POST_BEEP_PASSWORD
1
Incorrect password used to access SETUP
