AKA (Label): Model 90 S, Product number (P/N): 90S (90 S),
Keywords/Tags: 90S (90 S)
Date of intro: ~1975, Origin: Japan (List), Dimensions: 118x74x20mm, Weight: 115g,
Power: 6V: (AAA x4) + Adaptor,
Display: Type = Display (VFD) (List), Digits = 8+1,
Number of keys: 22, #Key-Black: 8, #Key-Blue: 3, #Key-White: 11,
Miscellaneous switch: [on-off],
Classification: / Pocket,
Featuring: Procent, Square root, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Resemblance with: ROYAL: 90S (version-1), (Resemblance 033),
Known Serial-numbers: 90S69152006 (90S 69.152.006) (List of all S/Ns from IMPERIAL)
Collector value: 7/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Internet: Link-1: VINTAGE CALCULATORS WEB MUSEUM