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Re:What books would you recommend to read about ZX Spectrum ... by neilwilson on Monday August 20, 2018 @05:57PM (#17804376)
The original orange manual is pretty impressive. It even has the z80 opcodes in the back for when you graduate to assembler

And of course it's on the web.

http://www.worldofspectrum.org/ZXBasicManual/