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Z80 assembly language programming

By Lance A. Leventhal

128 machine language for beginners

By Richard Mansfield

Commodore 128 assembly language programming

By Mark Andrews

Level II ROMs

By Mark D. Goodwin

6502 assembly language subroutines

By Lance A. Leventhal

Z80 assembly language subroutines

By Lance A. Leventhal

Introduction to the Z80 microcomputer

By Adi J. Khambata