I O S R E F E R E N C E -Post Code - Nexcom PEAK 6320A User Manual

PEAK 6320A User's Guide
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 Description
(hex)
C0 1. Turn off OEM specific cache, shadow...
2. Initialize all the standard devices with default values standard devices
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
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
2. OEM specific cache initialization (if needed)
0A 1. Initialize the first 32 interrupt vectors with corresponding Interrupt handlers
2. Issue CPUID instruction to identify CPU type
3. Early Power Management initialization (OEM specific)
BIOS Setup
includes:
-DMA controller (8237)
-Programmable Interrupt Controller (8259)
-Programmable Interval Timer (8254)
-RTC chip
compressed System BIOS & Option ROMs
MODBINable Cyrix Register Table
Initialize INT no from 33-120 with Dummy(Suprious)
Interrupt Handler
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