IS-DOS
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iS-DOS is disk operating system for Russian ZX Spectrum clones. iS-DOS has been developed in 1990 or 1991, by Iskra Soft Ltd (Leningrad, USSR).
It handles DS,DD floppy disks, hard disks, and CD-ROM.
Modern version for ATM (computer) is TASiS developed by NedoPC. It supports text mode and high memory of this machine.