|Aristo M85 -- no charger.|
Message #10 Posted by Mike (Austria) on 3 Nov 2011, 4:56 p.m.,
in response to message #9 by Katie Wasserman
The LED version of the Aristo M85 is designed to be operated with 3xAA Alkaline or NiCd cells or with a 7.5V= max.200mA voltage supply (Aristo #6790) to save batteries. I have just verified that minus is on center.
The M85 is NOT designed to recharge batteries inside the calculator, so please do NOT try to connect it to a current source. Aristo sold an external recharger (#6795) for NiCd cells. Actually, the M85 runs quite long on a single set of Alkalines, so you'd be best off just using these.
The "M85 S" model has a builtin NiCd battery. There was a later version of the M85 with a green fluorescent display operating on 2xAA cells.
This is one of the most beautiful and mechanically best calculators ever built. The keys have no click, but excellent response. They precisely register at approx. 1/3 of their 2mm travel without bouncing ever, even after 40 years of (initially intense, later occasional) use.
IIRC, its LEDs were manufactured by HP. Arithmetic is chain logic (i.e. no precedence, two levels of parentheses). Log, exponential and trigonometric functions are computed to six digits.
Kind regards and enjoy, Mike
Edited: 3 Nov 2011, 5:02 p.m.