AKA (Label): Model 90 K, Product number (P/N): 90K,
Keywords/Tags: 90K
Date of intro: ~1975, Origin: Japan (List), Dimensions: 120x75x20mm, Weight: 115g,
Power: 6V: (AAA x4) + Adaptor,
Display: Type = Display (VFD) (List), Digits = 8+1,
Number of keys: 19, #Key-Black: 5, #Key-Blue: 3, #Key-White: 11,
Keyboard Array (Rows x Columns): 05x04, Keyboard Layout: [CI] [C] [%] - [7] [8] [9] [(Division)] - [4] [5] [6] [x] - [1] [2] [3] [-] - [0] [.] [=] [+],
Miscellaneous switch: [on-off],
Classification: / Pocket,
Featuring: Procent, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Components: 7 Capacitor(s), 7 Diode(s), 9 Resistor(s), 2 Transistor(s),
Main Components: NEC: µPD943C,
Other components: ZEBRA: DCT05,
Resemblance with: ROYAL: 90K (version-1), (Resemblance 033),
Known Serial-numbers: 90K014748a (90K 014748 (a)) | 90K014974 (90K 014974) (List of all S/Ns from IMPERIAL)
Collector value: 7/10,
Internet: Link-1: VINTAGE CALCULATORS WEB MUSEUM