Description: NEW in box with cassette and manual MACHINE CODE TEST TOOLTutor and Debug Program SINCLAIR ZX81 16k Edition F O Ainley INTRODUCTION (From Page 1 of the 32 page manual) Welcome to this introduction to machine code. I have prepared this text tobe used in conjunction with the Machine Code Test Tool program (from here onabbreviated and referred to as MCTT) in order to give you practical examplesand "hands-on" experience ot using machine code. Using the MCTT you canenter and test your own machine code programs as well as examine the ZX81ROM and how your BASIC programs are stored in the RAM memory.Before beginning to read this book I strongly recommend that your readchapter 25 of your Sinclair ZX81 Basic Programming bookentitled "How the computer works". It was not my intention to write a complete treatise on the Zilog Z80 (themicroprocessor used in the ZX81) but if, after completing theexercises in this book, you wish to go deeper into the subject I canrecommend two books which I have found particularly useful. They are: Z80 Instruction HandbookUnderstanding your ZX81 ROMNat WadsworthDr. Ian LoganSCELBI Publications Melbourne House Publishers
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