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ANDOS is a Russian operating system for Electronika BK-0010, Electronika BK-0011 and Electronika BK-0011M series computers. It was created in 1990 and first released in 1992. Initially it was developed by Alexey Nadezhin (by whose name the system is named) and later also by Sergey Kamnev, who joined the project. It was the only widespread system on BK series computers that used MS-DOS-compatible file system format. ANDOS used the FAT12 filesystem on 800 Kb floppy disks. For Electronika BK-0011M and Electronika BK-0011 ANDOS provided Electronika BK-0010 emulation by loading BK-0010 ROM image into BK-0011(M) RAM. In minimal configuration the system was able to occupy less than 4 Kb of RAM.

ANDOS
DeveloperAlexey Nadezhin and Sergey Kamnev (ANCO company)
Written inAssembly language
Working stateAbandoned
Source modelClosed source
Latest release3.30 / December 1997; 21 years ago (1997-12)
PlatformsElektronika BK (PDP-11 architecture)
Default user interfaceDisk Master or BK Shell graphical non-windowing file managers
LicenseProprietary, commercial and freeware versions existed, latest version is free for download from the official site.
Official websitewww.df.ru/~andos/ at the Wayback Machine (archived August 28, 2009)

The system was able to support up to 64 disk drives (or hard drive partitions) as well as RAM disks in the computer's memory and tape recording. It also was able to have read-only access to MicroDOS file system format disks, although in the last version this function was transferred from system core to the file manager and became optional.

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