A clone of the TurboDOS operating system for TNS computers from JZD AK Slušovice.
TNS-DOS version 2.07 corresponds best to TurboDOS version 1.2.
Milena Varadinková's contemporary testimony:
At the end of 1987, I worked on the TNS-DOS operating system. We didn't have enough programming capacity to invent a brand new network operating system, so we didn't disdain Turbo DOS, which came to us only in translated form in the form of a kind of library. This system was compatible with CP/M and, in addition, allowed mutual sharing of disks and printers between interconnected computers (much like today's Windows 95, but due to the limited memory, everything had to be parameterized in advance and the system generated directly to measure). However, the system contained errors on the one hand, and on the other hand, the full network version bit off a significant part of the 64 kilobytes of memory, so that there was no memory left to run our own applications. We tried to get the source texts from the author's company in Germany, but it no longer existed. Apparently she came up with her eight-bit operating system too late - west of the Iron Curtain, eight-bit computers had already rung their bells. All that was left was to create the source texts using reverse translation and then make the appropriate adjustments, the most important of which was probably memory mapping. By pushing our own system to another page of memory, we got a whopping 62 kilobytes to run the program.