Section 4. Keyboards - IBM XT 5160 Technical Reference

SECTION 4. KEYBOARDS
Introduction 4-3
83-Key Keyboard Description 4-3
Block Diagram 4-5
Keyboard Encoding and Usage 4-6
Encoding 4-6
Character Codes 4-6
Extended Codes 4-9
Extended Functions 4-9
Shift States 4-9
Special Handling 4-11
Extended Functions 4-12
Keyboard Layouts 4-12
French Keyboard 4-13
German Keyboard 4-14
Italian Keyboard 4-15
Spanish Keyboard 4-16
UK Keyboard 4-17
US Keyboard 4-18
Connector Specifications 4-19
Keyboard Logic Diagram 4-21
101/102-Key Keyboard 4-22
Description 4-22
Cables and Connectors 4-23
Sequencing Key-Code Scanning 4-23
Keyboard Buffer 4-24
Keys 4-24
Power-On Routine 4-25
Power-On Reset 4-25
Basic Assurance Test 4-25
Commands from the System " 4-26
Reset (Hex FF) 4-26
Commands to the System 4-26
BAT Completion Code (Hex AA) 4-26
BAT Failure Code (Hex FC) 4-26
Key Detection Error (Hex FF) 4-27
Overrun (Hex FF) " 4-27
Keyboard Scan Codes 4-28
Keyboard
4-1