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Calculators: Handheld: Eltex 2000 -NC
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Size (actual): |
79.8mm
x 146.5mm x 28.4mm (max) (w,h,d) |
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Power: |
6V DC using 4 x AA size batteries. It accepts an adaptor/charger (undefined though 4.5V centre positive worked fine) through a socket on the top side to the far left. | ||
| Case: | Made from a two-piece matt dark and light grey plastic case. On the top front, just below some fake ventilation groves is a black and metallic sticker with the brand name, sitting in its own recess. A neutral plastic display filter sits raised in its own recessed area and is has a further raised silver painted escutcheon. This latter design is going to be very prone to wear - which my example confirms. The keyboard area sits flush with the calculator body but appears recessed by another raised trim. The key surround is spray-painted silver and has engraved letters for the on/off switch. The short keys produce a loud click when used and are similar to many Hanimex models. | ||
| Display: | 8 digit blue VFD with a ninth digit for negative, battery saver and error indicators. |
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| Features: | Standard four functions with percentages, battery saver | ||
| Age: | 1975 | ||
| Manufacturer: | Eltex Electronic D-755 Rastatt (Germany), no serial number on my example. | ||
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Comments:
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Basic early design with quite a few bugs from a brand that was only operating in the mid 1970s. Very similar to some Hanimex models, so suspect their may be a link. |
| Components: | 1 x IC: Texas Instruments
TMS0851NC 7515 (date code week 15 of 1975) 28 DIL pin 0.6" width
black plastic 1 x display: 9 digit VFD unit glass round face 2 x transistors 3 x diodes 5 x capacitors 22 x resistors 1 x DC-DC converter: Sumida 034 019 |
| Boards: | The main board is fixed to the rear with three screws. The keyboard is fixed to the front with four rivets. The two are joined by 15 thick wires. Not exactly built for easy servicing! |
| Construction: | Remove the four screws from the rear (two are inside the battery compartment) and the front lifts off - but not easily as there is a jumble of wires between the keyboard and the main board. My example has a small bit of polystyrene between the keyboard unit and battery box to keep them apart. |
| Logic comments: | (C/CE) cancels an incorrect numerical entry, pressing a second time clears the calculator |
| Input overflow is suppressed, keying in a ninth digit is ignored | |
| There is automatic constant on all four functions | |
| Negative numbers are shown by a minus in the immediate left digit travelling into the far left (ninth) digit thereby allowing full eight digit negative numbers. | |
| Divide by zero results in zero and an "C" in the far left (ninth) digit and is recoverable using (C/CE) | |
| Overflow shows the result with "C" (or "E" if negative) in the far left (ninth) digit and is recoverable using (C/CE) | |
| There is a battery save function: after around 22 seconds the display switches off except for the "-" sign in the far left (ninth) digit: recovery is by use of the (D) key | |
| This calculator has the pseudo fixed decimal bug; key in (0)(.)(0)(0)(0)(+)(1)(=) and the answer will be "1.000". This fixed decimal mode remains for addition and subtraction until the result requires more precision. | |
| It has the post divide to zero suppression bug: key in (1)(/)(1)(0)(=)(=)(=) etc until you get "0" then (+)(6)(=) gives "6.0000000" |
