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| 6 Technical Reference | |
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| Diagnostic LED Decoder |
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G=Green,R=Red,A=Amber | Description |
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Code |
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| MSB |
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| LSB |
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08h | G | Off | Off | Off | Verify CMOS Checksum. | |
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07h | Off | G | G | G | Read Microcode updates from | |
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| BIOS ROM. | |
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07h | Off | G | G | G | Initializing the processors. Set up | |
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| processor registers. Select least | |
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| featured processor as the BSP. | |
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0Bh | G | Off | G | G | Hook before the keyboard BAT | |
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| command is issued. | |
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0Ch | G | G | Off | Off | Keyboard Controller Test: The | |
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| keyboard controller input buffer | |
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| is free. Next, issuing the BAT | |
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| command to the keyboard | |
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| controller. | |
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0Eh | G | G | G | Off | Init after Keyboard Test: The | |
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| keyboard controller BAT | |
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| command result has been | |
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| verified. Next, performing any | |
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| necessary initialization after the | |
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| keyboard controller BAT | |
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| command test. | |
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0Fh | G | G | G | G | Write Command Byte 8042: The | |
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| initialization after the keyboard | |
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| controller BAT command test is | |
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| done. The keyboard command | |
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| byte will be written next. | |
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10h | Off | Off | Off | R | Keyboard Init: The keyboard | |
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| controller command byte is | |
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| written. Next, issuing the pin 23 | |
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| and 24 blocking and unblocking | |
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| commands. | |
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10h | Off | Off | Off | R | Disable and initialize 8259. | |
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