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Calculators: Handheld: Texet 880A Executive
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Size (approx): | 77mm (max) x 135mm x
22mm (max) (w,h,d) Weight 80g excluding batteries |
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Power: |
9V DC, 1 x PP3 size battery. It accepts an adaptor through a socket is on top side on the right. The on/off switch on the right hand side just above the display. | ||
| Case: | Slim and square shaped two-piece case in black and light grey (almost silver) matt plastic. Two aluminium panels for the display and keyboard surround which are both printed; one in black the other in black and blue. The red plastic display filter is very slightly angled. Display viewing angle is rather limited. Blue printing tries to gather the memory and cancel keys apart from the function and numeric ones. Solid enough calculator. The on/off switch is on the right hand side about where the display is. Keys are hollow-sounding click type but work well enough. | ||
| Display: | 8 digit red LED with bubble lens (no ninth digit) | ||
| Features: | 4 function calculator with percentages, register exchange and four function memory | ||
| Age: | 1979. Original Woolworth's price sticker on the box at £2.99. | ||
| Manufacturer: | Texet. No country of origin, though it is probably Hong Kong, Serial Number T062554. | ||
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Comments:
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Quite cheerful colour scheme. One of two calculators to say they are a Texet 880. This example still has the plastic covering the aluminium panels. The only way to know this is from the manual that is labelled 880A. From the circuit board number it looks like it should have been called the M860. The logic is appallingly bad. |
| Components: | 1 x CPU: MOS MPS7650 3779 (date
code week 37 of 1979), 22 pin DIL 0.3" width black plastic 1 x LED display: eight digit with integral bubble lens, NS A1188 721 |
| Boards: | The main board (M860 03E0019 1P0361 SH-2 REV-A) sits face down on the keyboard assembly with eight plastic pillars on the rear section to keep everything in place. The keyboard assembly (880A REV A 0571 260576 1D1) is attached to the front with four lugs and melted plastic rivets |
| Construction: | Held together with internal lugs only so quite difficult to open without causing damage. If in doubt, don't bother. The easiest way I found was to pop the top edge by pushing out the rear section, then travel down the sides and the back will come off. |
| Logic comments: | The (CE) button is used to clear last entry of a number and (C) to clear the whole calculator - well it should - the (C) keys also acts like a (CE) key |
| Overflow on number input is suppressed, keying a ninth digit is ignored | |
| An overflow is not flagged - it just shows the eight most significant digits - and you can carry or or divide your way out of trouble, if you get to more than 24 digits the display resets to zero | |
| Negative numbers are shown with a "-" sign in the immediate left digit but as there is no ninth digit you are limited to the display of seven digit numbers - you can carry on calculating but you have to remember it is negative | |
| Divide by zero results in a "00000000" (with no decimal point) calculation can continue another divider | |
| There is no constant on any function | |
| There is no indication of memory store - you have to remember it | |
| You cannot overflow the memory - just carry on adding number and the eight most significant digits are displayed | |
| The (X/Y) key is a register exchange key | |
| Percentages work a little differently from normal as the key is a divide by 100 key: to do 12% of 50 key in (5)(0)(*)(1)(2)(%)(=), to mark up us the plus key instead i.e. (5)(0)(+)(1)(2)(%)(=) | |
| It suffers the divide to negative zero bug: key in (0)(-)(1)(=) to get "-1" and keep dividing by ten until you get "-0" |
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Measuring 145mm by 80mm by 33mm
this bold yellow and black Texet box stands out in a shop display very
well. Not much bigger than the calculator means there were few
extras sold with this.
The Model number "Texet 880" is a sticker, so this box covered more than one model.
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There is also a basic instruction manual, 4pp black only named 880A Instruction Manual. It is 130mm by 64mm. Notice the code on the bottom M860 which matches the board ref. |
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