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Contents

Preface vii
1 Architecture of the BBC Machine 1
2 The 6502 Microprocessor 33
3 The 6502 Instructions and Addressing Modes 52
4 Handling the Resident Assembler 77
5 Multi-byte Loops 101
6 Sort Routines 113
7 Using Subroutines, Macros and Look-up Tables 157
8 Direct Screen Addressing and Hardware Scrolling 173
9 Interrupt Techniques and the User Port 193
Appendix A: Binary and Logic 215
Appendix B: Operating System Calls 234
Appendix C: 6502 Complete Instruction Set 235
Appendix D: Glossary of terms 249
Answers to Self Test Questions 254
Index 257

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