About μOS



TRIANGULAR μOS is small GUI operating system for 8-bit Commodore computers: Commodore PET, VIC-20, C64, CBM-II and C128.
It bridges the gap between nostalgia and modernity, offering a glimpse into the past through the lens of BASIC programming.

On this website you will find news about TRIANGULAR μOS and latest versions to download, as well as links to emulators and useful TOOLS.

TRIANGULAR μOS for Commodore PET

TRIANGULAR μOS for Commodore VIC-20

TRIANGULAR μOS for Commodore 64

TRIANGULAR μOS for Commodore CBM-II

TRIANGULAR μOS for Commodore 128

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TRIANGULAR μOS 1.27 for Commodore 64

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TRIANGULAR μOS 1.27 for Commodore 64 [29-09-2023]:           [ DOWNLOAD ]  [ SDK ] - Filenames convention changed from filename>ext[ension] to standard filename.ext[ension] e.g. uos>cfg to uos.cfg - Added SYSTEM DISK folder for use with SD2IEC - GUI: Menu Start button in the center of taskbar now made from purple TRIANGULAR logo - WORDS: file extension changed to .txt - MONITOR simplified running Machine Language program function - STAR WARS X-Wing vs TIE Fighter (based on PET version) in place of CHUCK CHALLENGE - CHUCK CHALLENGE added as extra on System Disk - Various other bugfixes and improvements
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TRIANGULAR μOS 1.29 for Commodore Plus/4

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TRIANGULAR μOS 1.29 for Commodore Plus/4 [19-11-2023]:             [ DOWNLOAD ]  [ SDK ] -  Supports Commodore Plus/4 with 64 KB of RAM and TED chip - Some BASIC 3.5 commands implemented -  GUI: New color theme - MATH can use mouse pointer only -  SYNTH simplified and adapted to TED music capabilities -  IPONG by FeCO and LCD RACE by Roepipi in place of SNAKES and LUNAR LAND - Minor bugfixes and improvements
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TRIANGULAR μOS 1.28 for Commodore CBM-II [29-10-2023]:           [ DOWNLOAD ]  [ SDK ] - Supports Commodore CBM-II P/500 series - GUI: PETSCII mouse pointer reintroduced and Start Menu button is sprite-less - SNAKES and LUNAR LAND from PET version in GAMES folder in place of removed TAXI,  RIFT RESCUE and CHUCK CHALLENGE games  - Minor bugfixes and improvements
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