Chapter 3
BIOS Power-On Self Test (POST)
The AMIBIOS provides all IBM standard POST routines, as well as enhanced AMIBIOS POST routines. POST supports CPU
internal diagnostics. POST codes are accessible via I/O Port 80h.
POST Phases
When the system is powered on, the AMIBIOS executes two types of routines:
●
System Test and Initialization
(test and initialize motherboards for normal operations) and
●
System Configuration Verification
(compare defined configuration with hardware actually installed).
BIOS Error Reporting
Errors are reported in one of two ways:
If...
Then...
the error occurs before
the display device is
initialized,
a series of beeps will sound. Beep codes
indicate that a fatal error has occurred. The
AMIBIOS Beep Codes are described on the
next page.
the error occurs after the
display device is
initialized,
an error message is displayed. Displayed
AMIBIOS error messages are explained on
page . A prompt to press <F1> can also
appear with displayed errors.
Summary of Contents for 42 Series
Page 1: ...American Megatrends Inc Series 42 Mark V Baby Screamer 80386 Motherboard User s Guide ...
Page 2: ...MAN 642 Rev C 9 11 92 ...
Page 13: ......
Page 35: ...A29 SA02 B29 5 A30 SA01 B30 OSC A31 SA00 B31 GND ...
Page 59: ......
Page 82: ......
Page 85: ...SRAM Locations ...