Welcome to TRIANGULAR μOS world


TRIANGULAR μOS is small GUI operating system for 8-bit Commodore computers: Commodore PET, VIC-20, C64 and C128.

On this website you will find news about TRIANGULAR μOS and latest versions to download.

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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

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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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