Aristo M64

Serial Number 2LT18 0033 (molded on upper edge)
Accessories Protective plastic cover
Condition Near mint
Acquired 4.9.2002
Accessory Advertisement sheet

Serial Number 2LF01 0085 (molded on upper edge)
Accessories Protective plastic cover (rather scratched up).
Condition Very good! Arrived with terribly corroded batteries but works perfectly after some cleaning.
Acquired 9.2.2004
Type, Precision, Input Mode Simple, 8 digits, no exponent, Algebraic
Programmable No
Memory One summation register on the 2LF unit. It can be accessed using the "M" prefix key. A small dot is lit on the left side of the display if the register is non-zero.
Display 9 digit 7-segment red LED. According to the "Collection Lütjens" the was 2LF version was initially built with 4+5 digit LED segments from HP which had a small visible space between the 4th and 5th digit. Later units (and the unit pictured above) used 3+3+3 digit LED segments from Litronix.
Special features Instruction sheet on the back of the calculator
Original Pricing, Production Unknown, approx. 1973-1975, Dennert & Pape, Hamburg Germany
Batteries 3x AA or DC power supply, 4.5V, minus on center
Only rechargeable batteries may be used together with a power supply!
Important: The power switch turns on battery operation. In case there are no batteries the power switch must be in the "0" position to actually turn on the unit!
Dimensions Length 15cm, Width 6cm, Height 2cm
Links Collection Lütjens.
Deutsches Museum München.
Comment Not much functionality but a cool design!
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