Vintage Electronic Calculators:

Overview of Brands


BUSICOM: 121DK (version-2)
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AKA: junior, AKA (Label): NCM, 121-DK, Product number (P/N): 121DK (121-DK),
Keywords/Tags: 121DK (121-DK) | junior
Date of intro: ~1972, Origin: Japan (List),
Power: AC,
Number of keys: 25, #Key-Green: 9, #Key-Grey: 5, #Key-White: 11,
Keyboard Array (Rows x Columns): 04x08, Keyboard Layout: [CE] [7] [8] [9] [-] [x] [EX] [CM] - [C] [4] [5] [6] [+] [(Division)] [M=] [RM] - [1] [2] [3] [=] [M=] [M-] - [0] [.] [M+],
Decimal switch: [9-6-5-4-3-2-1-0], Round switch: [N-5/4], Miscellaneous switch: [OFF-ON],
Classification: / Desktop with Display,
Featuring: Logic-technology: LSI (Large Scale Integration), calculator-chipset,
Original Equipment Manufacturer : BUSICOM: 121DK (version-2) (List of all Export-OEM-models from BUSICOM), Resemblance with: NATIONAL CASH REGISTER (NCR): 18-22,
Known Serial-numbers: 30SB104019 (List of all S/Ns from BUSICOM)
Courtesy of: CALCUSEUM (Serge DEVIDTS),


Label, name plate
S/N: 30SB104019

Created: 25-oct-2018, Manual-update: 07-jan-2022, Batch-update: 25-feb-2024             

# Pageloads since 25-oct-2018 : 71             

2 Pic(s),


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