A graphical desktop for the ZX Spectrum

A graphical desktop for the ZX Spectrum 48K, written in Z80 assembly.

Overlapping windows with a z order and focus, pull down menus, a heap, an event queue, a storage layer with swappable backends, dialogues, controls, a notepad, a clock, a calendar, a two pane file manager, and a settings panel that actually changes things. It all fits in 48K on a machine from 1982, and it can drag a window inside a single 69,888 T state frame.

It runs on the real thing, not just an emulator.