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Casio
Mini CM-602
1973
Aristo
M27
1972-73

Prinztronic Micro

Brief History
In 1970, Sharp and american Rockwell built the first calculator using LSI integrated circuits (Sharp QT-8 series), but the available technology did not allow to made really small equipments. The first battery-powered pocket-sized calculators in 1971-72 operates only for a few hours. In 1972, Sharp introduced the ELSI MINI (EL-801), which not oly used japanese-made state-of-the-art integrated circuits from Toshiba, but despite of high power consumption LED displays it can be operates from 4 pieces of AA batteries for 15 hours. Rechargeable battery pack were marketed for more economical applications.

A slightly modified, re-designed version were manufactured for british Dixons corporation under the name Prinztronic Micro: it can only be used with standard batteries.

After spreading CMOS technology and finishing development of reliable liquid crystal displays, first calculators with low power consumption were introduced from 1973.

Manufacturer:Dixons International (United Kingdom)
OEM:Sharp Corporation (Japan)
OEM model:EL-801
Mfg. date:1972
Size:7,3×10,4×2,9 cm
Weight (ready for operate):234 g
Type:four-function
Capacity:8 digits (input/display)
8 digits (internal precision)
Operating logic:arithmetic
CPU:Toshiba T3103+T1271
Registers:2 standard (with saving the pending operation)
1 constant (with saving the pending operation)
Features:Ffloating-point notation
Display:8+1 digit LED
Power:4×AA-type battery

Micro

Inside of the Micro

PCBs of the Micro: the upper contains the display, the lower is the soul of the machine
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