Vintage Electronic Calculators:

Overview of Brands


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AKA: MATH I, AKA (Label): MODEL: 260, Product number (P/N): 260,
Keywords/Tags: 260 | I | MATH I
Date of intro: ~1975, Origin: USA (List), Dimensions: 310x225x130mm, Weight: 3550g,
Power: AC,
Display: Type = Display (None) (List), Extra Display features: Type = Display (LED: as bulb) (List), Quantity = 1,
Number of keys: 23, #Key-Blue: 15, #Key-Beige: 4, #Key-Orange: 4,
Decimal switch: [$-0-2-5],
Classification: / Desktop with Printer,
Featuring: Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Main Components: WESTERN DIGITAL: PS1762B,
Other components: SPRAGUE: ULN2001A {2x},
Known Serial-numbers: 677328 (List of all S/Ns from ADDMASTER)
Collector value: 8/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Info: At first glance, this calculator looked to me as an electro-mechanical device, but LED unmasked the 'electronic" character.
It seems nothing is quite common on this machine, from the rather rare calculator-on-a-chip to the strange printer-mechanisme inside.
If anyone should have more info, please do mail.


Internals (keyboard)

Internals (printer)

Internals (printer)

Internals (PCB)

Internals (PCB bottom)
ART80301REV280302 (ART 8030-1 REV 2, 8030-2)

Key cap

Label, name plate / Bottom
S/N: 677328

Created: 14-oct-2003, Manual-update: 13-nov-2017, Batch-update: 21-jan-2022             

# Pageloads since 2018: 39             

8 Pic(s),


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