New Stuff
Author
Links
Guest book
Web-log
Bric-a-brac
Calculators
Components
Ephemera
Events
Glossary
History
Hit or Miss
Radios
Transport
Valves
Wanted
Metal Puzzles
Caravan
|
|
|
Size (approx): |
73mm
x 120mm x 19mm
(w,h,d) |
| Power: | 6V DC, 4 x AAA size batteries. Also accepts adapter/charger (undefined) through a socket on the bottom edge to the far right. | ||
| Case: | Square case with back and sides made of a U-shaped piece of brushed aluminium. Black plastic calculator body slides down nearly half way to reveal battery compartment. Pronounced ridges on the side to aid grip. Squishy but positive action keys in a variety of colours. Logo and model number is printed on inset aluminium panel. Logo is also painted on the top side in white. The green, sloping plastic display filter gives a clean bright image. | ||
| Display: | 8 digit green VFD with a ninth digit for negative, error and memory indicators | ||
| Features: | 4 function calculator with percentages change sign, pi, square root, register exchange and four function memory. Switched floating and fixed decimal function. | ||
| Age: | 1976 | ||
| Manufacturer: | Manufacturer: TA Vertriebs GmbH, D8500 Nurnberg, Germany. Type EC 24B, Serial No. 66.064.843. | ||
| Comments: | Unusual slide out design clear display and weighty quality-feeling calculator. Button colours are a bit of a jumble. The logic is very good with full recovery and really only let down by negative square roots. The cover is black stiffened plastic with collapsible edges, open top and large square side cut-outs. |
| Components: | 1 x cpu: Texas TMS1044NL KS 7642
(week 42 of 1976), 28 pin DIL, 0.5" width black plastic 1 x 9 digit VFD flat face single tube display: Futaba 9-ST-10 6F (June 1976) 2 x transistors 9 x diodes 5 x capacitors 0 x resistor arrays 5 x resistors 1 x transformer: Zebra DCT-10 |
| Boards: | The keyboard assembly (81SGK167-3.4 91SGK167-62) (GICO 51.9.26 - date code 26th September 1976) sits on top of the battery compartment and main cpu (IH-016) board. They are joined by 17 strong short wires. The whole assembly sits loose, held in place by the battery terminal connections. |
| Construction: | Push the sides down as if to change the batteries. Whilst gently pulling out the metal sides, continue to pull the body of the calculator down through the metal stops. Remove the back by levering the upper coin slot and prizing off the two edge posts. |
| Logic comments: | The (Cl) button is used to clear last entry of a number and (C) to clear the whole calculator |
| Overflow on number input is suppressed: keying in a ninth digit is ignored | |
| An overflow error displays the result and "C" (or "E" if negative) in the far left (ninth) digit and is recoverable using (Cl) | |
| Divide by zero results in zero and a "C" which is recoverable using (Cl) | |
| There is automatic constant on all four functions | |
| Negative numbers are flagged by a "-" sign in the ninth digit thereby allowing full eight digit negative numbers. | |
| The change sign (-) function can be used in mid number entry but not before | |
| Negative square roots are allowed and result in a negative number | |
| The (X<>Y) key is used to exchange the current display for the last register | |
| Memory store is indicated by an upper "n" in the far left (ninth) digit | |
| Overflow in memory is flagged and stores the result shifted | |
| The on/off switch doubles as a floating or fixed 2/3 digit decimal selector | |
| No bugs found |
