HP Dc7700 HP Compaq dx7300 and dc7700 Business PC Technical Reference Guide, 1 - Page 186
C.2.5 Keyboard Commands, Table C-1., Keyboard-to-System Commands
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Keyboard C.2.5 Keyboard Commands Table C-1 lists the commands that the keyboard can send to the system (specifically, to the 8042-type logic). Command Table C-1. Keyboard-to-System Commands Value Description Key Detection Error/Over/run 00h [1] Indicates to the system that a switch closure FFh [2] couldn't be identified. BAT Completion AAh Indicates to the system that the BAT has been successful. BAT Failure FCh Indicates failure of the BAT by the keyboard. Echo EEh Indicates that the Echo command was received by the keyboard. Acknowledge (ACK) FAh Issued by the keyboard as a response to valid system inputs (except the Echo and Resend commands). Resend FEh Issued by the keyboard following an invalid input. Keyboard ID 83ABh Upon receipt of the Read ID command from the system, the keyboard issues the ACK command followed by the two IDS bytes. Note: [1] Modes 2 and 3. [2] Mode 1 only. C-10 www.hp.com Technical Reference Guide