In the collection of SOFTWARE EQUIPMENT FOR DIAGNOSTIC SYSTEMS OF NUCLEAR POWER PLANTS it is stated:
The evaluation part of SPD is based on. delivery n.p. Metro Blansko. the basis of the evaluation part is the digital computer ADT 4410 or ADT4500, disk drives KDP 720 or KDP 723, input/output system DASIO 600 and peripheral devices. From the supplied system software (SIO, BCS, RTE-C, DOS III), only the RTE-C operating system was used for one sub-program in the first two blocks, none of the state-of-the-art systems was selected for technical reasons. In a special (non-commercial) way, the RTE-II operating system was secured, which became the main software system of SPD computers for the first three units. For the next supply of SPD computers, the implementation of the DOS IV operating system is expected.