IBM 5150 Hardware Reference Manual page 13

Keyboard Encoding and Usage ................... 3-11
Encoding ........................................ 3-11
Character Codes .................................. 3-11
Extended Codes .................................. 3-13
Extended Functions ............................ 3-13
Shift States .................................... 3-14
Shift Key Priorities ............................. 3-15
Special Handling ................................. 3-15
System Reset .................................. 3-15
Break ......................................... 3-16
Pause ......................................... 3-16
Print Screen ................................... 3-16
Keyboard Usage .................................. 3-17
BASIC Screen Editor Special Functions ............. 3-19
DOS Special Functions ........................... 3-19
Low Memory Maps .............................. 3-21
0-7F Interrupt Vectors ............................ 3-21
BASIC and DOS Reserved Interrupts (80-3FF) ...... 3-22
Reserved Memory Locations (400-5FF) ............. 3-22
BASIC Workspace Variables ...................... 3-23
APPENDICES .................................. A-O
Appendix A: ROM BIOS Listing ................. A-I
Appendix B: Assembly Instruction Set Reference ... B-1
Appendix C: OfCharacters Keystrokes and Color .... C-l
Appendix D: Logic Diagrams ..................... D-l
Appendix E: Unit Specifications .................. E-l
Glossary ......................................... G-l
Bibliography .................................... Bib-l
Index ........................................... 1-1
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