User Guide

2.4 System Board 2 Troubleshooting
Satellite M20 Maintenance Manual 2-15
Table 2-2 Printer port LED boot mode status (2/3)
LED Status
(Hexadecimal)
Test Item
Description
20H DEBUG_KEYB_SELFTEST_CTLR Send selftest command (AAH) to test Keyboard
control l or i f o.k. return (55h)
21H DEBUG_KEYB_RESET_KEYBOARD Test Keyboard Control l er and i niti alize keyboard
control l or
22H DEBUG_POST_CHECK_CMOS_RAM Send test petten to Check CMOS Ram
23H DEBUG_POST_TEST_BATT_CMOS_
S
Test Battery Fail & check CMOS X-SUM
24H DEBUG_HWIO_TEST_DMA_CTLRS Use DMA to copy data for Test the DMA controllers
25H DEBUG_HWI O_I NI T_8237 Ini ti al i ze 8237A Control l er
26H DEBUG_POST_INIT_VECS Install and Iniitialize interrupt Vectors
27H DEBUG_RAM_QUI CK_SI ZE Enter memory protect mode,use change RAM bank to
do RAM Qui ck Si zi ng
28H DEBUG_RAM_PROT_ENTRY_1 Memory protected mode entered safely
29H DEBUG_RAM_SIZE_DONE Test the basic 640k ram,RAM test compl eted
2AH DEBUG_RAM_PROT_EXI T Protected mode exi t successf ul
2BH DEBUG_CS_SHADOW_SETUP Shadow system and video BIOS to RAM if CMOS
requests shadowSetup Shadow
2CH DEBUG_VI DEO_EQUI P_I NI T_I NI T Goi ng To I niti al ize 6845 CRT controllor
2DH DEBUG_VI DEO_BW_SEARCH Search For Monochrome Adapter
2EH DEBUG_VI DEO_COLOR_SEARCH Search For Col or Adapter
2FH DEBUG_VI DEO_SI GNON Si gnon messages di spl ayed
30H DEBUG_OEM_CONFI G_KBD_CTL For speci al i ni ti al i ze of keyboard control l or
31H DEBUG_KEYB_PRESENT_TEST Test the keyboard controllor ,If Keyboard
Present
32H DEBUG_KEYB_TEST_I RQ1 Clear keyboard buf f er and sen keyboard command
to test Keyboard Interrupt
33H DEBUG_KEYB_TEST_CMD Send keyboard command to turn off keyboard LED
and Test some Keyboard Command Byte
34H DEBUG_RAM_FULL_TEST TEST memory procedure, f or test,bl ank and
count al l RA M
35H DEBUG_RAM_PROT_ENTRY_2 Eneter the memory protected mode for test all expand
memory
36H DEBUG_RAM_TEST_DONE Test and bl ank all memory compl ete
37H DEBUG_RAM_PROT_EXIT_2 Switch the memory from Protected mode to real mode
38H DEBUG_KEYB_OUTPUT_PORT Disable A20 status for memory test finish
39H DEBUG_CS_CACHE_SETUP Setup Cache Control l er
3AH DEBUG_HWIO_TEST_PERIODIC Check and test the timer 0 interrupt f uncti on i s Worki ng
3BH DEBUG_GEN_CHECK_RTC test for RTC ticking
3CH DEBUG_GEN_INIT_HARD_VECS Install and initialize the hardware vectors
3DH DEBUG_MOUSE_INIT Clear keyboard buffer for search and Init the Mouse
3EH DEBUG_KEYB_SET_L EDS_1 Send keyboard command to Update keyboard NUMLOCK status
3FH DEBUG_OEM_DEVICE_CONFI
G
special init of COMM and LPT ports