JSEP

Unified system of electronic computers

Rows

• R1: approx. 1968 to 1974, "model" IBM System 360;
• R2: approx. 1977 to 1982, "model" IBM System 370;
• R3: circa 1982 to 1985 (EC 1027), production ceased in 1989.
• R4: we only have the MUVYS prototype

Marking of devices and peripherals

• 0XXX – power supplies and special equipment
• 1XXX – digital computers, systems, complexes, multiprocessor systems
• 2XXX – processors;
• 3XXX – RAM memory and storage devices;
• 4XXX – multiplex or selection channels;
• 5XXX – drive control devices and magnetic drives themselves (NML and NMD);
• 6XXX – device for entering information (from PC punched cards, PL – punched tape);
• 7XXX – devices for input and output of information (e.g. terminals),
• 8XXX – device for teleprocessor data processing
• 9XXX – equipment for preparing, copying, sorting and decrypting storage media

References

• https://www.retrobajty.cz/jednotny-program-jsep/ (WebArchive)