2.4 System Board |
| 2 Troubleshooting | |||
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| Table | Printer port LED boot mode status (2/3) | ||
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| LED Status | Test Item |
| Description |
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| (Hexadecimal) |
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| 20H | DEBUG_KEYB_SELFTEST_CTLR | Send selftest command (AAH) to test Keyboard |
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| controllor if o.k. return (55h) |
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| 21H | DEBUG_KEYB_RESET_KEYBOARD | Test Keyboard Controller and initialize keyboard |
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| controllor |
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| 22H | DEBUG_POST_CHECK_CMOS_RAM | Send test petten to Check CMOS Ram |
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| 23H | DEBUG_POST_TEST_BATT_CMOS_S | Test Battery Fail & check CMOS |
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| 24H | DEBUG_HWIO_TEST_DMA_CTLRS | Use DMA to copy data for Test the DMA controllers |
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| 25H | DEBUG_HWIO_INIT_8237 | Initialize 8237A Controller |
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| 26H | DEBUG_POST_INIT_VECS | Install and Iniitialize interrupt Vectors |
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| 27H | DEBUG_RAM_QUICK_SIZE | Enter memory protect mode,use change RAM bank to |
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| do RAM Quick Sizing |
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| 28H | DEBUG_RAM_PROT_ENTRY_1 | Memory protected mode entered safely |
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| 29H | DEBUG_RAM_SIZE_DONE | Test the basic 640k ram,RAM test completed |
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| 2AH | DEBUG_RAM_PROT_EXIT | Protected mode exit successful |
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| 2BH | DEBUG_CS_SHADOW_SETUP | Shadow system and video BIOS to RAM if CMOS |
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| requests shadowSetup Shadow |
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| 2CH | DEBUG_VIDEO_EQUIP_INIT_INIT | Going To Initialize 6845 CRT controllor |
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| 2DH | DEBUG_VIDEO_BW_SEARCH | Search For Monochrome Adapter |
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| 2EH | DEBUG_VIDEO_COLOR_SEARCH | Search For Color Adapter |
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| 2FH | DEBUG_VIDEO_SIGNON | Signon messages displayed |
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| 30H | DEBUG_OEM_CONFIG_KBD_CTL | For special initialize of keyboard controllor |
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| 31H | DEBUG_KEYB_PRESENT_TEST | Test the keyboard controllor ,If Keyboard |
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| Present |
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| 32H | DEBUG_KEYB_TEST_IRQ1 | Clear keyboard buffer and sen keyboard command |
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| to test Keyboard Interrupt |
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| 33H | DEBUG_KEYB_TEST_CMD | Send keyboard command to turn off keyboard LED |
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| and Test some Keyboard Command Byte |
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| 34H | DEBUG_RAM_FULL_TEST | TEST memory procedure, for test,blank and |
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| count all RAM |
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| 35H | DEBUG_RAM_PROT_ENTRY_2 | Eneter the memory protected mode for test all expand |
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| memory |
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| 36H | DEBUG_RAM_TEST_DONE | Test and blank all memory complete |
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| 37H | DEBUG_RAM_PROT_EXIT_2 | Switch the memory from Protected mode to real mode |
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| 38H | DEBUG_KEYB_OUTPUT_PORT | Disable A20 status for memory test finish |
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| 39H | DEBUG_CS_CACHE_SETUP | Setup Cache Controller |
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| 3AH | DEBUG_HWIO_TEST_PERIODIC | Check and test the timer 0 interrupt function is Working |
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| 3BH | DEBUG_GEN_CHECK_RTC | test for RTC ticking |
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| 3CH | DEBUG_GEN_INIT_HARD_VECS | Install and initialize the hardware vectors |
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| 3DH | DEBUG_MOUSE_INIT |
| Clear keyboard buffer for search and Init the Mouse |
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| 3EH | DEBUG_KEYB_SET_LEDS_1 | Send keyboard command to Update keyboard NUMLOCK status |
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| 3FH | DEBUG_OEM_DEVICE_CONFIG | special init of COMM and LPT ports |
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TECRA S1 Maintenance Manual |
