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Calculators: Handheld: Texas Instruments TI-30
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Size (approx): |
80mm
(max) x 145mm x 35mm (max) (w,h,d) |
| Power: | 9.0V DC, 1 x PP3 size battery. It looks like it should accept an adaptor as both models of this calculator have a hole, but no socket on the right side, just above mid-point. Does anyone know if later models dropped the socket to save cost or that the charging kit included the socket? | ||
| Case: | Two-piece matt black plastic case with gold brushed metal keyboard surround. Red plastic display filter is sloped inwards and highlighted with a gold painted escutcheon. The keys are labelled in blue or black and sectioned with two shades of gold paint. Classic bow shaped Texas. | ||
| Display: | 8 digit red LED display with bubble lens - ninth used for minus sign and decimal point. | ||
| Features: | 17 scientific functions and two digit exponent. Pi and flexible memory system. Front key to toggle on/off. | ||
| Age: | 1980 | ||
| Manufacturer: | Made by Texas Instruments Incorporated. Made in the USA. Serial No. 0485324. A second model, Serial No. 4679RCI is made in Italy. | ||
| Comments: | Lovely to watch complex calculations light up the first digit segments. Robust logic with high (10/9 digit) precision, and nice clicking keys. Other version were available with different keyboard surround colours. |
| Components: | 1 x cpu: Texas Instruments TMC
0891 1 x display: 9 digit LED module |
| Boards: | The main board houses the cpu and display module and rests loose above the display filter. It is connected to the keyboard assembly via 13 strong wires. |
| Construction: | I cannot find an easy way to open this calculator |
| Logic comments: | The Clear key (ON/C) is used to once to clear an input number a second press clears the calculator, so it actually an On/CE/C key |
| Overflow on the input of a number is suppressed, keying a ninth digit is ignored | |
| The constant function is selected by the (K) key | |
| The negative sign is shown on the immediate left digit, pushing into the ninth to allow 8-digit negative numbers | |
| The calculator goes into power save mode after about 30 seconds - a travelling decimal from left to right reminds you - to recover, continue you calculation | |
| Errors result in the word "Error" being displayed, these are not recoverable. | |
| You can type in eight digit decimals as the decimal point travels into the ninth digit, but the leading zero disappears | |
| There is no memory indicator - you have to remember it. | |
| Pi is held to ten digits "3.1415927464", logs are to ten digits, but trig functions are 9 digit. |
