Hand-held Calculators

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Display is 8 digits, red LED.

4-functions, %, square, square root.

7.2v (6x AA) rechargeable.

Main integrated circuit - MOS MCS2523 (in this example date coded mid-1973).

83 x 149 x 40 mm (3.3" x 5.9" x 1.6").


Made by Micro Instrumentation & Telemetry Systems, Inc., Albuquerque, New Mexico.

1973 price - $129.95 assembled or $99.95 as a kit.

With instrucrions & case.

Shown with instruction manual and home made leather case. Note the large thickness of the calculator (40 mm/1.6") since most of the rear accomodates 6 rechargeable cells.


The 6 rechargeable cells in the rear of the calculator.


The circuit board, with the MOS MCS2523 integrated circuit on the right.

MITS (Micro Instrumentation & Telemetry Systems, Inc.) is famous as the company which in 1975 introduced the Altair 8800. This was the first mass-marketed home computer, used an Intel 8080 processor, and was the originator of the standard S-100 bus.

MITS produced a small range of calculators, which could be purchased ready assembled or as a self-assembly kit. There were several other companies supplying calculator kits, including Heathkit and Sinclair, which gave some cost saving and also the satisfaction of having assembled the calculator oneself.

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Hand-held Calculators

Sharp QT-8B
Sanyo ICC-0081 Mini Calculator
Canon Pocketronic
Sharp EL-8 & Facit 1111
Busicom LE-120A & LE-120S
Sanyo ICC-82
Minolta Minolcom
Brother PRO-CAL 408
Bowmar 901B
Ragen Microelectronic
Sharp EL-811 & derivatives
Royal Digital III & IV
Busicom LE-100A handy
Busicom LE-80A handy
Hewlett Packard HP-35
Canon LE-10
Rapidman 800
Texas Instruments 2500
Lloyd's Accumatic 100
Sinclair Executive
Casio Mini
Sanyo ICC-809
Sharp EL-801
Texas Instruments SR-10
Sperry Remington 661D & 661
Olympia CD 81
apf Mark V
Ramsgate M-11
Iain Jones International Mini A
Hewlett-Packard HP80
Heathkit IC-2009
Summit Ko9V, K16 & SE88M
Unicom 102
Victor 85
Elka 101
RFT minirex 75
Sharp EL-120
Sharp EL-805
Bowmar MX-55
Keystone 88 & similar
Hewlett-Packard HP-65
Casio fx-10
Casio AL-8 & AL-10
Commodore 776M & 796M
Novus 650
Rockwell 8R
General Instrument EZ3000
Check Tronic & CheckMaster
Edmund Scientific 1945
Texas Instruments Spirit of '76
Pulsar Calculator Watch
Compuchron Calculator Watch
Adler Lady & Sir
Elektronika C3-15
Commodore S61
Texas Instruments TI-30
Canon Multi 8
Casio ST1
Texas Insturments TI 58
Wrist Calculators
Kosmos I & Kosmos Astro
Hanimex Calculator-Recorder
Navigation Calculators
Panasonic Electronic Ruler
Teal Photon
Casio Mini Card LC-78
Sharp EL-825
Elektronika MK-33
Sharp PC1211/Tandy TRS80 PC1
Slide Rule
Otis King L

Vintage Calculators

© Text & photographs copyright Nigel Tout  2000-2007 except where noted otherwise.