User’s Guide
BIOS Setup
4-33
Power-On Boot
After you have made all the changes to CMOS values and the system can-
not boot with the CMOS values selected in Setup, restart the system by
turning it OFF then ON or Pressing the "RESET" button on the system case.
You may also restart by simultaneously press <Ctrl>, <Alt>, and <Delete>
keys. Upon restart the system, immediately press <Insert> to load BIOS
default CMOS value for boot up.
BIOS Reference - POST Codes
NOTE: ISA POST codes are typically 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 compresses codes into temporary DRAM area
including the compresses 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 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)
