Vintage Electronic Calculators:
CALCUSEUM Home page

Overview of Brands

Colleagues

KEYSTONE: 390
(Page 1/1)


Product number (P/N): 390,
Keywords/Tags: 390
Date of intro: 1973, Origin: USA (List), Dimensions: 133x81x45mm,
Power: Rechargeable, Adaptor: KEYSTONE_adaptors: 275, 275E,
Display: Type = Display (Gas disharge) (List), Brand = BURROUGHS: BR09250M, Digits = 8+1, Extra Display features: Type = Display (LED: as bulb) (List), Quantity = 1,
Number of keys: 20, #Key-Black: 15, #Key-Brown: 5,
Keyboard Array (Rows x Columns): 05x04, Keyboard Layout: [MR] [MC] [%] [C] - [7] [8] [9] [(Division)] - [4] [5] [6] [x] - [1] [2] [3] [-] - [0] [.] [=] [+],
Decimal switch: [DECIMAL_Normal-$], Miscellaneous switch: [MEMORY_On-Off], Indicators: Charge,
Classification: / Pocket,
Featuring: Procent, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip, Memories: 1,
Related with: KEYSTONE_parts: (Box) 390,
Components: 114 ... 14 Capacitor(s), 25 Diode(s), 58 Resistor(s), 15 Transistor(s), 1 IC(s),
Main Components: ROCKWELL: 15330PC,
Known Serial-numbers: 0168989 | C287068 | C336742 (List of all S/Ns from KEYSTONE)
Initial Cost Price: USD159.95, Collector value: 8/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Internet: Link-1: VINTAGE TECHNOLOGY, Link-2: SMITHSONIAN MUSIC

Item

Perspective, profile view

Display

Accessories

Label, name plate / Examples of use
S/N: C336742

/ Protection (pouche)

Created: 30-oct-2011, Manual-update: 05-dec-2020, Batch-update: 03-oct-2022             

# Pageloads since 2018: 88             

6 Pic(s),

                     

If you have a (better) personal picture and/or missing info about any model not listed: Please do send a Mail