Peak 555A User’s Guide
BIOS Setup 4-
45
NOTE: When this error appears, the system will
boot in ISA mode, which allows
you to run the EISA Configuration Utility.
BIOS Reference - POST Codes
Note:
EISA POST codes are typically output to port address 300h.
ISA POST codes are output to port address 80h.
POST
(hex)
Description
C0
1. Turn off OEM specific cache, shadow...
2. Initialize all the standard devices with default values
standard devices
includes:
-DMA controller (8237)
-Programmable Interrupt Controller (8259)
-Programmable Interval Timer (8254)
-RTC chip
C1
Auto-detection of onboard DRAM & Cache
C3
1. Test system BIOS checksum
2. Test the first 256K DRAM
3. Expand the compressed codes into temporary DRAM area
including the
compressed System BIOS & Option ROMs
C5
Copy the BIOS from ROM into E0000-FFFFF shadow RAM so
that POST will go faster
01-02
Reserved
03
Initialize EISA registers (EISA BIOS only)
04
Reserved
05
1. Keyboard Controller Self-Test
2. Enable Keyboard Interface
06
Reserved
07
Verifies CMOS’s basic R/W functionality
BE
Program defaults values into chipset according to the
MODBINable Chipset
Default Table
09
1. Program the configuration register of Cyrix CPU according
to the
MODBINable Cyrix Register Table
2. OEM specific cache initialization (if needed)
0A
1. Initialize the first 32 interrupt vectors with corresponding
Interrupt handlers
Initialize INT no from 33-120 with Dummy(Suprious)
Interrupt Handler
2. Issue CPUID instruction to identify CPU type
3. Early Power Management initialization (OEM specific)
