English
Popular tutorial book for Sinclair ZX81 users. There is a text version here: Mastering Machine Code on Your ZX81 . This is a cleaned-up version of the file here: https://ia800604.us.archive.org/view_archive.php?archive=/1/items/World_of_Spectrum_June_2017_Mirror/World%20of%20Spectrum%20June%202017%20Mirror.zip&file=World%20of%20Spectrum%20June%202017%20Mirror/sinclair/books/m/MasteringMachineCodeOnYourZX81OrZX80(MasteringMachineCodeOnYourZX81)(RestonPublishingCompanyInc).pdf
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