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 1.45 for Commodore 128 [Development page]

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TRIANGULAR μOS 1.45 for  Commodore 128  Task list (finished 13 of 26) : - μPETSCII-256 font system is updated and have now 4 fonts  ✓ - System s ounds serviced by PLAY - Sprite  data block file format changed to .res   ✓ - BIOS: Minor improvements   ✓ - PSoD: Implemented across the board along with file checks - Sprites are not flashing during disk operations   ✓ - GUI: Minimalize icon on right side of Task bar is changed to left pointed  arrow   ✓ - GUI: Multiple mouse pointer shapes => Currently in development - GUI: Selection lists added => Currently in development - GUI: Mouse pointer position memory adds extra bit handling   ✓ -  Settings: Rearrangement of Window & Desktop tabs   ✓ - Settings: Faster drawing of selection labels   ✓ - Disk: Fix new file list not empty  ✓ - CMD: Display disk type on disk error  ✓ - CMD: New F-key commands   ✓ -  ...
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TRIANGULAR μOS 1.44 for Commodore 128

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TRIANGULAR μOS 1.44 for  Commodore 128  [18-02-2024] :             [ DOWNLOAD ]  [ SDK ] - New character set: μPETSCII-256 is added that contains lower- and upper-case letters  and new graphic characters - BIOS: Expanded and improved - GUI: Introduces slim style - GUI: Updated message box with warning types in BASICCALLY API - GUI: Message box error shows on missing file - Settings: there are now 21 wallpaper patterns - This C128: New Disk and CMD icons - Disk: Faster disk content retrieving mechanism - CMD: 34 times faster disk content retrieving using DIRECTORY command - Monitor: 4 times faster converting hex number to decimal using DEC command - Games improved and bug fixed - SDK adds Charset program for alternating characters - Template and SDK documentation updated - Improvements and bugfixes
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