The xyz operating system

ZX Spectrum 48K ROM replacement.

Tomaz Stih

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Description

A fully preemptive multitasking OS with processes, threads, sync objects, timers, memory management, mouse & keyboard drivers, and ZX microdrive support.

Details

Multitasking operating system for ZX Spectrum 48K with a early Macintosh like GUI. The project consists of

x compiler tools. Not reinventing warm water here, the plan is to update SDCC linker to enable relocatable binaries.
y os (yos). The operating system. Currently console mode, but tty will be replaced with a GUI.
z windows (zwin). Early Macintosh like GUI on top of yos.

yos and zwin will work on original hardware and be a ROM replacement.

Files

yos.gif Yos today got microdrive support. Graphics Interchange Format - 3.07 MB - 03/31/2026 at 22:57		Preview

Project Logs

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Microdrives are now supported
Tomaz Stih • 03/31/2026 at 22:59 • 0 comments

I added support for microdrives today.
0.3 Teaser
Tomaz Stih • 07/18/2021 at 22:08 • 0 comments
Version 0.3 is out
Tomaz Stih • 07/18/2021 at 22:02 • 0 comments
Version 0.3 of yos is out and has
- startup code
- vectors and interrupts
- basic code for threads (round robin scheduler)
- basic code for processes
- timers
- synchronization events and thread blocking
- syscalls
- resource accounting
- tty
- ysh (y shell)
Plan for 0.4:
- stabilize processes and threads incl. cleanup functions after exiting
- clipped bitmaps ... I need those for mouse cursor, fonts, icons, bitmaps.