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Kickstarter funded an updated and expanded version of Andrew Hewson & John Hardman's 1983 book "40 Best Machine Code Routines for the ZX Spectrum" - featuring a new Spectrum Next section written by Jim Bagley.

https://www.hueygames.com/books

0:00 Intro
0:40 Cover & Perks
1:14 Contents & Forewords
1:47 Section A
3:47 Section B
6:56 Appendices & Spectrum Memories
7:53 Outro & Previous Book

Also available at the above link - Hints & Tips for Videogame Pioneers, Andrew Hewson's book on the history of Hewson Consultants (and successor 21st Century Entertainment).

At the time of recording, the Kickstarter campaign for the next book - Hewson Helpline - is underway at:

https://www.kickstarter.com/projects/robhwson/hewsons-helpline-for-the-zx-spectrum-the-book


40 Best Machine Code Routines provides many helpful snippets of code - including graphics routines, BASIC toolkit commands and more. While this book in itself will not teach you how to program Z80 machine code, it does provide a useful and structured approach to building a program out of smaller subroutines. Additional reference material is included to help with converting between numbers, lists of assembly commands and the aforementioned new section giving the routines updated for the new Spectrum Next computer.

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This is not paid promotion or sponsorship.
The video creator backed the Kickstarter campaign to receive the Elite Edition with its perks (including a bonus USB cassette of extra content).