AKA (Label): MODEL 121-F, ELECTRONIC CALCULATOR, Product number (P/N): 121F (121-F),
Keywords/Tags: 121F (121-F)
Date of intro: 1977, Origin: Japan (List), Dimensions: 255x185x60mm, Weight: 1250g,
Power: AC,
Display: Type = Display (VFD) (List), Digits = 12+1,
Number of keys: 25, #Key-Black: 11, #Key-Blue: 10, #Key-Red: 4,
Decimal switch: [F-4-3-2-0-A], Round switch: [5/4-(Blank)], Miscellaneous switch: [(Blank)-K],
Classification: / Desktop with Display,
Featuring: Procent, Square root, Memories: 1,
Main Components: TEXAS INSTRUMENTS: TMS1273NL,
Other components: SHARP: IR1403,
Serie-members: CITIZEN: 121F (version-1) (1 Switch); CITIZEN: 121F (version-2) (3 Switches, 24 Keys); CITIZEN: 121F (version-3) (3 Switches, 25 Keys),
Known Serial-numbers: 60354034 (List of all S/Ns from CITIZEN)
Initial Cost Price: DEM260, Collector value: 7/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Internet: Link-1: CENTRE FOR COMPUTING HISTORY