AKA: Programmable, AKA (Label): CAT. NO. 65-650, EC-4000 PROGRAMMABLE CALCULATOR, Product number (P/N): 65-650,
Keywords/Tags: 65-650 | EC4000 (EC-4000) | Programmable
Date of intro: 1978, Origin: USA (List), Dimensions: 146x76x35mm, Weight: 180g,
Power: Rechargeable,
Display: Type = Display (LED) (List), Digits = 12,
Number of keys: 40, #Key-Brown: 23, #Key-White: 12, #Key-Yellow: 5,
Classification: / Pocket,
Featuring: Scientific functions, Square root, PI, Programmable, Memories: 8, Programmable Steps: 50,
Related with: TEXAS INSTRUMENTS_docu: 1019262-1 (Instr.) EC4000 RADIO SHACK,
Main Components: TEXAS INSTRUMENTS: TMC1501NL,
Original Equipment Manufacturer : TEXAS INSTRUMENTS: 57, Resemblance with: HIRADASTECHNIKA SZOVETKEZET: PTK1050 (version-1); HIRADASTECHNIKA SZOVETKEZET: PTK1050 (version-2), Made by: TEXAS INSTRUMENTS (List of all Import-OEM-models for RADIO SHACK),
Known Serial-numbers: 6528011 (List of all S/Ns from RADIO SHACK)
Collector value: 8/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Internet: Link-1: DATAMATH CALCULATOR MUSEUM, Link-2: Robert LACOSTE