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| UNOS | |
|---|---|
| Developer | Charles River Data Systems |
| Written in | C |
| OS family | Unix-like |
| Working state | Historic |
| Final release | 9.3.3+ / July 15, 1997; 28 years ago (1997-07-15) |
| Marketing target | Real-time data acquiring and processing |
| Supported platforms | Motorola 68k,Intel 80486 |
| Kernel type | Monolithic |
UNOS is a discontinuedreal-time operating system (RTOS); it was the first32-bitUnix-like system with real-time extensions.[citation needed] It was developed by Jeffery Goldberg, MS. who leftBell Labs after usingUnix and became VP of engineering for Charles River Data Systems (CRDS), now defunct. UNOS was written to capitalize on the first 32-bitmicroprocessor, theMotorola68kcentral processing unit (CPU).[citation needed] CRDS sold a UNOS based 68K system, and sold porting services and licenses to other manufacturers who hadembedded CPUs.[1]
Jeff Goldberg created an experimental OS using only eventcounts for synchronization, that allowed a preemptivekernel, for a Charles River Data Systems (CRDS)PDP-11. CRDS hired Goldberg to create UNOS and began selling it in 1981.[2][better source needed]
UNOS was written for theMotorola 68000 series processors. While compatible withVersion 7 Unix, it is also an RTOS.[citation needed] CRDS supported it on the company's Universe 68 computers, as didMotorola'sVersabus systems.[3] CRDS's primary market wasOEMs embedding the CRDS unit within a larger pile of hardware, often requiring better real-time response than Unix could deliver.[citation needed]
UNOS has a cleaner kernel interface than UNIX in 1981.[citation needed] There was e.g., a system call to obtainps information instead of reading /dev/kmem.[citation needed]
UNOS requiredmemory protection, with the 68000 using anMMU developed by CRDS;[citation needed] and only used Motorola MMUs after UNOS 7 on the68020 (CRDS System CP20)[citation needed] (using theMC68851 PMMU).
UNOS was written in the programming languagesC andassembly language, and supportedFortran,COBOL,Pascal, andBusiness Basic.[citation needed]
UNOS from CRDS never supported pagedvirtual memory[2] andmultiprocessor support had not been built in from the start,[2] so the kernel remained mostly single-threaded on the few multiprocessor systems built.[2]A UNOS variant enhanced byH. Berthold AG under the name vBertOS added demanded page loading and paged processes in 1984,[citation needed] but was given up in favor ofSunOS because of the missingGUI and the missing networking code in Spring 1985,[citation needed] when Berthold imported the first Sun to Europe.[citation needed]
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