Pages about ZX Spectrum

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  8 December 2022

  Spaces in variable names in ZX Spectrum BASIC

  Variables in ZX Spectrum BASIC can contain spaces, which is useful for naming variables with multiple words, but it makes parsing difficult.

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  21 March 2016

  Emulating ZX Spectrum graphics in JavaScript

  I'm using EcmaScript 6 Proxy objects to keep track of dirty blocks in emulated ZX Spectrum video RAM in a browser. I describe how the ZX Spectrum video RAM works, and implement an emulator using modern JavaScript.

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  27 February 2016

  "Hello, World!" in ZX Spectrum machine code

  A "Hello, World!" program in Z80 assembler for the ZX Spectrum can be written by calling the CHAN_OPEN and PRINT subroutines to send the "Hello, World!" string to the screen channel.