minitron 811

Display is 8 digits, red LED.

4-function, %, memory.

4.5v (3x AA batteries).

69 mm x 118 mm x 24 mm (2.8" x 4.7" x 1").

Elektronska industrija-Niš, made in Yugoslavia (now Serbia).

For comparison here is the ANITA 811.

To replace the batteries the rear cover slides up, which also reveals the label which shows:

Ei (Electronics industry) OOUR FACTORY CALCULATING MACHINES-NIŠ.

 

Has the three-pin adaptor socket so it can be powered from the ANITA AC Adaptor while containing disposable, non-rechargeable, batteries.

The calculator has two circuit boards, besides the blue keyboard.

The circuit board underneath has components of an oscillator.

Close up of the top circuit board showing the Rockwell A4130CA integrated circuit (here date coded 1976, week 09).