Vintage Electronic Calculators:

Overview of Brands


MELCOR: 550 (version-1)
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AKA (Label): MODEL 550, Product number (P/N): 550,
Keywords/Tags: 550
Date of intro: ~1974, Origin: USA (List), Dimensions: 152x76mm,
Power: 9V + Adaptor,
Display: Type = Display (LED) (List), Brand = BOWMAR: Optostic,
Number of keys: 24,
Classification: / Pocket,
Featuring: Procent, Square root, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip, Memories: 1,
Related with: MELCOR_parts: 68B021-1 (Panel); MELCOR_parts: 68B021-2 (Panel); MELCOR_parts: 68B020-1 (Panel),
Components: 3 PCB(s),
Main Components: MOS TECHNOLOGY: MCS2541; RAMSGATE: 024-022,
Other components: FAIRCHILD: 9664PC {2x},
Serie-members: MELCOR: 550 (version-1) (No colored Keys); MELCOR: 550 (version-2) (Colored Keys),
Known Serial-numbers: 550774 (List of all S/Ns from MELCOR)
Collector value: 8/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),


Created: 27-feb-2011, Manual-update: 13-aug-2020, Batch-update: 26-feb-2024             

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