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| Calculators: Handheld: Aristo
M85 |
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Size (actual): |
78.0mm
(max) x 151mm x 20.5mm with cover (w x h x d) |
| Power: | 4.5v DC using 3 x AA size batteries. It accepts an adaptor (type 6795) through a socket on the top side to the far left. You have to take the whole back off to access the three (2 plus 1 separated) battery slots, one of which is not used. | |||
| Case: | The base is a well shaped gloss and matt white plastic piece whilst the front section is matt black plastic. The top area has white printed text with the brand and model number. Two white switches sit in a recess with more white printed text. A narrow red coloured plastic display filter sits flat and flush and gives a bright, easy to read display. The slightly recessed keyboard area has white printed text for the higher functions. A lower area has the country of origin in even more white printed text. The keys are medium travel with a very springy feel and soft click. A large black printed grey panel on the back has instructions in German and English and sits in its own recess. A full-frontal smoked plastic cover does a good job of protecting the calculator. | |||
| Display: | 8+2+2 red LED for 8+2 scientific display | |||
| Features: | Standard four functions with change sign, square root, reciprocal, pi, brackets, register exchange and eight function memory. Logs trigs, degree-radian conversions, powers and switched angular mode. | |||
| Age: | 1975 | |||
| Manufacturer: | Aristo, made by Dennert & Pape AG, Hamburg, Germany. No serial number. My example came with a German receipt for DM89.00 dated 4 December 1978! | |||
| Comments: | This is a earlier generation of the range of calculators from the famous slide rule manufacturer. The generic case has small panels where another two switches could be. Reasonably clear display and a lovely design that throbs quality. The logic is not tested. |
| Components: | 1 x cpu: (Unbranded Rockwell)
A4802 F, 42 pin staggered DIL, 0.6" width
black ceramic with metal lid 2 x IC: ITT XK8510 7526 (date code week 26 of 1975) 16 pin DIL, 0.3" width black plastic (suspect display drivers) 1 x IC: ITT XK8509 7540 (date code week 40 of 1975) 16 pin DIL, 0.3" width black plastic 1 x 12 digit LED display 1 x transistor 4 x diodes 3 x capacitors 4 x resistors 2 x variable resistors 1 x sealed unknown unit - suspect voltage converter |
| Boards: | The main cpu board (Aristo M85...) is fixed to the front with plastic lugs whilst the keyboard assembly sits underneath. |
| Construction: | Remove the dust cover from the front. Prize up the front section of the calculator by putting a blunt implement in the lower edge slot (as you would do to change the batteries). A metal plate then shrouds the main assembly, which is covered by a German, English, French and Spanish instructions for battery insertion. There are four screws under this label. The metal plate will then lift away. |
| Logic comments: | Unable to test the logic |
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The image left
shows the calculator with the rear section and metal screening plate
removed. Notice the battery compartments, two on the top and one on
the bottom (right).
What looks like un unbranded Rockwell IC is accompanied by three ITT ICs with high quality tantalum bead capacitors and no expense spared variable resistors. I think the red block is a voltage converter unit. Compare with the earlier Aristo M66S inside (opens new window).
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The box measures approx 210mm x 80mm x 35mm so is much longer than the calculator. Is is printed in yellow black and red and oddly enough does not contain a model number! | The
manual measures approx 145mm x 77mm Black and white throughout
with a half tone front page. The descriptive text is all in German,
but the numerous examples are titled with eight different languages.
52 printed pages, printed in Germany, ref 05.05.01-3c (c) 1975.
It also came with a Day-Glo orange Warning sheet to use only the Aristo adaptor. Also supplied was a yellow and black sheet for the two year guarantee.
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