Sinclair ZX Spectrum OS

Notes about the Sinclair ZX Spectrum operating system & memory

Spectrum Memory Map Overview

Spectrum Memory Map

OS Calls

Operating System calls


The Spectrum’s screen memory layout

System Variables

System variables


Notes on BASIC for the Spectrum

+3 DOS

Notes on the Disk Operating System for the Plus 3


Last modified November 2, 2021: Add start of sinclair documentation (5ea25e6)