I have been scanning and using OCR on the original ZX81 (USA version) manual. For the things which would not convert to text, I have saved those as gif images - referenced from within the text such as <FIGURE 1-1>, etc. You will find in the zipped archive with the ASCII text file of each chapter the images of the corresponding figures.
If you care to view or download an actual size jpg image of the front cover (about 1.3 Meg),
click here.The following chapters are currently available for download. As I have the time to work on more chapters I will post them here.
Intro.zip - The title page, the FCC statement, and the Table Of Contents
Chap_1.zip - Setting up the ZX81
Chap_2.zip - Telling the computer what to do
Chap_3.zip - Comments on BASIC
Chap_4.zip - The Sinclair ZX81 as a pocket calculator
Chap_5.zip - Functions
Chap_6.zip - Variables
Chap_7.zip - Strings
Chap_8.zip - Computer programming
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