AKA (Label): MODEL 831RD, ELECTRONIC CALCULATOR, Product number (P/N): 831RD,
Keywords/Tags: 831RD
Date of intro: ~1977, Origin: Japan (List), Dimensions: 166x88x24mm,
Power: 3V: (AA x2) + Adaptor,
Display: Type = Display (VFD) (List), Digits = 8+1,
Number of keys: 28, #Key-Blue: 16, #Key-Grey: 11, #Key-Orange: 1,
Decimal switch: [F-1-2-4], Miscellaneous switch: [OFF-ON],
Classification: / Pocket,
Featuring: Procent, Square root, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip, Memories: 1,
Related with: CITIZEN_docu: (Broch.) Desk-top Calculators, Hand-held Calculators,
Main Components: TEXAS INSTRUMENTS: TMS1071NL,
Resemblance with: (Resemblance 007G),
Serie-members: CITIZEN: 831RD (2 Switches); CITIZEN: 831RDIII (3 Switches),
Known Serial-numbers: 905000949 (List of all S/Ns from CITIZEN)
Collector value: 7/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Internet: Link-1: Robert LACOSTE, Link-2: VINTAGE TECHNOLOGY