Product number (P/N): 6521,
Keywords/Tags: 6521
Date of intro: ~1965, Origin: Bulgaria (List), Dimensions: 530x450x220mm, Weight: 18000g,
Power: AC,
Display: Type = Display (Nixie) (List), Digits = 16,
Number of keys: 27,
Classification: / Desktop with Display / Memory (core),
Featuring: Logic-technology: DTL (Diode Transistor Logic), discrete components, Memory-technology: Memory (core),
Resemblance with: ELKA: 21A,
Known Serial-numbers: 143460HMM382069 (14346, 0H-MM N°3820-69) | 143482HMM382069 (14382, 0H-MM N°3820-69) | 223420H045562471 (22342, 0H-04 55624-71) | 224120H045562471 (22412, 0H-04 55624-71) | 224450H045562471 (22445, 0H-04 55624-71) | 239500H045562471 (23950, 0H-04 55624-71) | 25606OH045562471 (25606, OH045562471) (List of all S/Ns from ELKA)
Collector value: 10/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Info: First Bulgarian electronic calculator, probably the 4th in history
Internet: Link-1: A-MUSEUM, Link-2: WIKIMEDIA