Product number (P/N): 4640,
Keywords/Tags: 4640
Date of intro: ~1976, Dimensions: 160x82x36mm,
Power: Rechargeable, Adaptor: NATIONAL SEMICONDUCTOR_adaptors: DC401,
Display: Type = Display (LED) (List), Digits = 8,
Number of keys: 36, #Key-Black: 4, #Key-Red: 1, #Key-White: 13, #Key-Yellow: 18,
Classification: / Pocket / RPN (Reverse Polish Notation),
Featuring: Scientific functions, Procent, Square root, Logic-technology: LSI (Large Scale Integration), calculator-chipset,
Original Equipment Manufacturer : NATIONAL SEMICONDUCTOR: 4640 (version-2) (List of all Export-OEM-models from NATIONAL SEMICONDUCTOR), Resemblance with: HIRADASTECHNIKA SZOVETKEZET: TK1024 (version-2),
Serie-members: NATIONAL SEMICONDUCTOR: 4640 (version-1) (No Red Key); NATIONAL SEMICONDUCTOR: 4640 (version-2) (One Red Key),
Collector value: 8/10,
Courtesy of: LACOSTE Robert,
Info: Version with 1 red key
Internet: Link-1: Robert LACOSTE