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Calculators: Handheld: Texas Instruments TI-1200
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Size (approx): | 70mm (max) x 138mm x
35mm (max) (w,h,d) Weight 110g excluding batteries |
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Power: |
9V DC, 1 x PP3 size battery. Also accepts adapter (undefined). Socket at top side in the middle. | |
| Case: | Typical Texas bulging shape this calculator tilts towards you at around 15 degrees. Dark brown two-piece mottled plastic case with smooth metal keyboard surround in cream. Key ID is black painted surrounded by gold boxes and topped of with a large orange surrounding. The functions are highlighted using a caramel colour. Model number is painted. There is gold painted rim to the flat and flush red plastic display filter. The brand name is on a metal painted plate stuck under the display. A basic calculation guide is attached to the back and the on/off switch is on the left side, just above midway. | |
| Display: | 8 digit red LED with bubble lens (ninth right-most used for minus flag) | |
| Features: | 4 function calculator with percentages | |
| Age: | 1975 | |
| Manufacturer: | Texas Instruments, made in Italy. Serial number missing on this one. | |
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Comments:
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Well built calculator with keys that give a positive click. LED display has a good angle of view. Apparently you can remove the keyboard plate to reveal the unused keys; a change sign and four memory key, which are used on the sister calculators like the TI-1250. Available from 1975 to 1977 this is an early model. |
| Components: | |
| Boards: | |
| Construction: |
| Logic comments: | The (CE) button is used to clear last entry of a number and the (C) to clear the whole calculator. |
| Overflow on number input is suppressed, typing in a nine digit number ignores the ninth digit | |
| An overflow error is flagged a flashing answer with the decimal point on the first digit. Number is recoverable with (CE) | |
| Divide by zero results in a flashing "0." | |
| There is automatic constant on all functions | |
| Negative numbers are flagged by a "-" sign in the immediate left digit, travelling into the ninth on 8 digit numbers. |
