ZX Spectrum

//////////////////////////////////////// R O M  ////////////////////////////////////////
Spectrum ROM	Memory map
https://skoolkid.github.io/rom/

An Assembly File Listing to generate a 16K ROM for the ZX Spectrum
https://www.tablix.org/~avian/spectrum/rom/zx82.htm

////////////////////////////////////// B A S I C //////////////////////////////////////
SINCLAIR ZX SPECTRUM BASIC Programming. By Steven Vickers
https://worldofspectrum.org/ZXBasicManual/index.html

ZX Basic Wiki
https://zxbasic.readthedocs.io/en/docs/

//////////////////////////////////////// Z 8 0  ////////////////////////////////////////
Zilog Z80/Command system
http://emuverse.ru/wiki/Zilog_Z80/%D0%A1%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D0%B0_%D0%BA%D0%BE%D0%BC%D0%B0%D0%BD%D0%B4

MATH:
http://z80-heaven.wikidot.com/math#toc10
https://map.grauw.nl/sources/external/z80bits.html