thingsaurus
This is a 'thesaurus for things' or similarity engine: results show things that have something in common with what you enter. The more stars, the more things in common! You can use it for research, recommendations or simply to explore ideas and related subjects.
Here are your results for OS4000...
Stars indicate closer matches.
OpenVMS 
- THEOS
- Burroughs MCP
- Cray Time Sharing System
- DEC MICA
- Multiple Console Time Sharing System
- Pick operating system
- Time Sharing Operating System
- Universal Time-Sharing System
- FlexOS 68K
- FlexOS 286
- FlexOS 386
- Integrity (operating system)
- Multiuser DOS
- Nucleus RTOS
- OS-9
- QNX
- REAL/32
- Sintran III
- Versatile Real-Time Executive
- GEC Computers
- GEC 2050
- GEC 4000 series
- GEC Series 63
- AWK
- Berkeley Software Distribution
- CATS (trading system)
- Cpio
- File Allocation Table
- Finger (protocol)
- KERNAL
- TRSDOS
- Time-sharing system evolution
- BBN Time-Sharing System
- Berkeley Timesharing System
- CDC Kronos
- Commercial Operating System
- Compatible Time-Sharing System
- CP/CMS
- Dartmouth Time Sharing System
- Edinburgh Multiple Access System
- HP Time-Shared BASIC
- IBM Remote Access Computing
- Incompatible Timesharing System
- Livermore Time Sharing System
- Michigan Terminal System
- MTS system architecture
- Multics
- MUSIC/SP
- NLTSS
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