5-4
3) System Diagnosis
(1) System Diagnostics Card
The Diagnostics Card shows the system operations during the POST (Power On Self Test) in a
2 d igit hexadecimal number by connecting the cable to the 10 pin connector below the PCMCIA slot
after separating the Top part. The card is used to evaluate the reason for the malfunction without
disassembling the system when the system malfunctions and to test if the system operates normally
after replacing a defective FRU.
(2) Debugging Code
In general, if a defect of the circuit or part is detected during the system test, the system stops at
a particular code. The error codes for each part of the system are listed in the following table.
Code Beeps POST Routine Description
02h Verify Real Mode
03h Disable Non-Maskable Interrupt
04h Get CPU type
06h Initialize system hardware
08h Initialize chipset with initial POST values
09h Set IN POST flag
0Ah Initialize CPU registers
0Bh Enable CPU cache
0Ch Initialize caches to initial POST values
0Eh Initialize I/O component
0Fh Initialize the local bus IDE
10h Initialize Power Management
11h Load alternate registers with initial POST values
12h Restore CPU control word during warm boot
13h Initialize PCI Bus Mastering devices
14h Initialize keyboard controller
16h 1-2-2-3 BIOS ROM checksum
17h Initialize cache before memory auto size
18h 8254 timer initialization
1Ah 8237 DMA controller initialization
1Ch Reset Programmable Interrupt Controller
20h 1-3-1-1 Test DRAM refresh
22h 1-3-1-3 Test 8742 Keyboard Controlle
24h Set ES segment register to 4 GB
26h Enable A20 line
28h Auto size DRAM
29h Initialize POST Memory Manager
2Ah Clea r 512 KB base RAM
2Ch 1-3-4-1 RAM failure on address line xxxx*
2Eh 1-3-4-3 RAM failure on data bits xxxx* of low byte of memory bus
2Fh Enable cache before system BIOS shadow
30h 1-4-1-1 RAM failure on data bits xxxx* of high byte of memory bus
32h Test the CPU bus-clock frequency
33h Initialize Phoenix Dispatch Manager
36h Warm start shutdown
- This Document can not be used without Samsung's authorization -
4. Troubleshooting
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