AKA: tip-in, AKA (Label): GT 539, Product number (P/N): GT539 (GT 539),
Keywords/Tags: GT539 (GT 539) | tipin (tip-in)
Date of intro: 1974, Origin: Germany (List), Dimensions: 135x80x24mm, Weight: 155g,
Power: 7.5V: (AA x5) + Adaptor,
Display: Type = Display (LED: DIL-module) (List), Digits = 8+1,
Number of keys: 22, #Key-Red: 3, #Key-White: 19,
Keyboard Array (Rows x Columns): 05x04,
Miscellaneous switch: [(Donut filled)-(Donut Outlined) K-0],
Classification: / Pocket,
Featuring: Procent, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Main Components: HELEC: 02/12; HELEC: 04/04; TEXAS INSTRUMENTS: TMS0604NC,
Resemblance with: (Resemblance 050),
Known Serial-numbers: 900385 | 900417 | 900668 | 900688 | 900734 (List of all S/Ns from HELEC)
Collector value: 8/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Internet: Link-1: VIRTUAL MUSEUM OF CALCULATORS