AKA (Label): PROFESSIONAL MEMORY by Radofin, MODEL 870 ELECTRONIC CALCULATOR, Product number (P/N): 870,
Keywords/Tags: 870 | PROFESSIONAL MEMORY
Date of intro: ~1975, Origin: Hong Kong (List), Dimensions: 135x68x23mm, Weight: 85g,
Power: 6V: (AAA x4) + Adaptor,
Display: Type = Display (LED) (List), Brand = NATIONAL SEMICONDUCTOR: A1198, Digits = 8+1,
Number of keys: 23, #Key-Blue: 10, #Key-Red: 2, #Key-White: 11,
Keyboard Array (Rows x Columns): 06x04, Keyboard Layout: [ON] [OFF] [C/CE] - [M] [RM] [CM] [(Division)] - [7] [8] [9] [x] - [4] [5] [6] [-] - [1] [2] [3] [+] - [0] [.] [%] [=],
Classification: / Pocket,
Featuring: Procent, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip, Memories: 1,
Related with: RADOFIN_docu: (Instr.) 870; RADOFIN_parts: (Box) 870,
Components: 18 ... 2 Capacitor(s), 1 Diode(s), 9 Resistor(s), 3 Transistor(s), 2 IC(s),
Main Components: GENERAL INSTRUMENT: CZL550,
Other components: (Unknown manufacturer): IC6404,
Known Serial-numbers: 87031137 (870-31137) | 87037618 (870-37618) | 87041819 (870-41819) (List of all S/Ns from RADOFIN)
Collector value: 7.5/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Internet: Link-1: VINTAGE TECHNOLOGY