CYMOS – CY64 Mock OS

This page is currently being reconstructed. See the below To-do list for what's planned for this page.

To do
  • Add download links for all currently backed up versions
  • Continue history section for CYMOS
  • Disclose development goodies leftover for サカキバラUI and CYMOS

CYMOS (formerly サカキバラUI) is a mock operating system designed for SmileBASIC.

This project was started December 26th, 2017.

There were the following versions:

  • サカキバラUI (3DS)
  • サカキバラUI: Nintendo Switch Edition
  • サカキバラUI: Python Edition
    • There's not much information available about this version. The last surviving copy is dated 16/10/2021 and 17/6/2022 for assets and the main program respectively. It's speculated the actual development time was rather short, estimated at just 1 month.
  • CYMOS (for SmileBASIC 3)

サカキバラUI: Switch Edition — History

Life span: 24/7/2020 - 28/10/2020 (4 months)

Being short and sweet, it was a disaster. I rushed the first version within 4 days that I had got my Nintendo Switch.

It didn't last very long, at all. Yes, it got killed within 4 months, due to the heavy mental pressure I had at the time from school.

I was so in distress, I wiped my save file on the Switch (and disabled cloud backup) so I don't have a backup of it anymore.

However, you can still get back to my Twitter profile and scroll all the way back to the timeframe and see the little progress I had before ultimately terminating it.

CYMOS — History

Life span: 29/1/2021 - today

CYMOS had its humble beginnings on SmileBASIC 4. Having a mock BIOS mostly finished and a bootloader that would eventually install packages too...

I got fed up with SmileBASIC 4 over the span of 2021 and moved over to make CYMOS for SmileBASIC 3 with the New Nintendo 3DS in mind, with enhancements if run on a Wii U. (If you're lucky enough to even have Petitcom BIG)

A very "proof-of-concept" version of CYMOS running in SmileBASIC 4. Glitchy graphics here and there but given a bit more features and a bit of polish, would have made it a solid first alpha release.

Note that the date shown in the video is not accurate. The files of this project are from 2021/1/11 to 2021/11/21. This proof-of-concept version on SmileBASIC 4 had a life time of 10 months, however, during this time I was quite inactive. The active development time is estimated to be only 2 months.

CYMOS on SmileBASIC 3 had a rocky start but is slowly building up.

During development of Beta 6, I started development on the CYX plugin and wanted to incorporate it into CYMOS as a kind of helper; a kind of showcase how CYX can change how SmileBASIC programs can run and what they can do. So I implemented various file-management-based features into CYX that allow reading from and writing to the SD Card as well as access to general system information.


There's no downloads available at this time. Check again later.