Decimo Realtone calculator

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Our 1973 Decimo Realtone model 9100  was very kindly donated by Barry Samuels and has a serial number of 5143200

Size (approx):
114mm x 193mm x 45mm (max)  (w,h,d)
Weight 514g excluding batteries but including strap
Power: 6.0V DC, 4 x C size batteries.  Also accepts adapter (Type 2Q11B, 6V DC, 200mA) through a top side socket on the right.   Remove adapter to operate with batteries.  There is an auto power off feature to save batteries.  Innovative two key on/off system.
Case: Large heavy battery-desktop machine that was built to last.  The case is made from two-piece mottled black plastic top and bottom and has thick metal panels on the sides, top and keyboard surround.  The latter wraps around the bottom and has some black printed text for the switch labels.  The top front has a large plastic sticker with the Decimo branding.  The area below has a recessed metallic sticker, printed in black and blue, with the Realtone brand and "auto shut off" text.  The keys are large, long travel and hollow sounding but work well enough.  The deep blue display filter is slightly inset and heavily tilted with white text for the numerals and symbol display. The rear has a large sticker with loads of calculation info.  There is a metal lug on the left hand side for the black plastic carry strap.
Display: 8 digit blue VFD display with a ninth used for negative, overflow and battery low indicators 
Features: Standard four function with switched constant, switched fixed decimal.  RPN logic.
Age: 1973

Thanks to for the information

Manufacturer: Decimo
Date: 1975

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This exhibit has a reference ID of CH6933. Please quote this reference ID in any communication with the Centre for Computing History.


Decimo Realtone calculator

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