MK-52 is the first Soviet micro-calculator with non-volatile electrically erasable memory (EPROM, type КР1601РР1 with a capacity of 4 Kbit, the number of rewriting cycles 10000), which ensures the safety of programs when the power is turned off and acts as a buffer when exchanging data with external devices. A block of this memory is capable of storing up to 512 program 8-bit words (or the contents of 72 data registers) and exchanging them with RAM. In addition, it is possible to connect an external ROM - PDU (memory expansion unit) with game and mathematical programs, which stored several dozen programs that make up the user library (these programs are recorded by the manufacturer) Also in MK-52 there is another expansion slot, which is installed for technological purposes and serves to diagnose MK in the process of its manufacture; unofficially, it was possible to connect external devices with its own controllers.
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