BECKHOFF CB4053 - Manual (Page 73)

Annex: Post-Codes
Beckhoff New Automation Technology CB4053 page 73
Code Description
93h Reading in of the hard disk boot sector for the inspection through the internal anti virus program
(trend anti virus code)
94h 1. Enabling of level 2 cache
2. Setting of the clock speed during the boot process
3. Final initialising of the chip set.
4. Final initialising of the power management.
5. Erase the onscreen and display the overview table (rectangular box).
6. Program “write allocation” at K6 CPUs (AMD)
7. Program “write combining” at P6 CPUs (INTEL)
95h 1. Program the changeover of summer-and winter-time
2. Update settings of keyboard-LED and keyboard repeat rates
96h 1. Multi processor system: generate MP-table
2. Generate and update ESCD-table
3. Correct century settings in the CMOS (20xx or 19xx)
4. Synchronise the DOS-system timer with CMOS-time
5. Generate an MSIRQ-Routing table..
C0h Chip set initialising:
- Cut off shadow RAM
- Cut off L2 cache (apron 7 or older)
- Initialise chip set register
C1h Memory detection:
Auto detection of DRAM size, type and error correction (ECC or none)
Auto detection of L2 cache size (apron 7 or older)
C3h Unpacking of the packed BIOS program codes into the random access memory.
C5h Copying of the BIOS program code into the shadow RAM (segments E000 & F000) via chipset
hook.
CFh Testing of the CMOS read/write functionality
FFh Boot trial over boot-loader-routine (software-interrupt INT 19h)