New Stuff
Author
Links
Guest book
Web-log
Bric-a-brac
Calculators
Components
Ephemera
Events
Glossary
History
Hit or Miss
Radios
Transport
Vales
Wanted
Metal Puzzles
Articles
Clocks
Calculators: Handheld: Texet 880 Executive
|
|
|
Size (actual): | 74.2mm (max) x
135.0mm x 22.2mm (max) (w,h,d) Weight 86g excluding batteries |
|
Power: |
9V DC, 1 x PP3 size battery. Also accepts an adaptor (undefined, but I found 4.5V centre positive worked fine) with a socket is on top side to the right. | ||
| 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. The on/off switch on the right hand side, in line with the display. 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, change sign (CS) and four function memory | ||
| Age: | 1977-1978 | ||
| Manufacturer: | Texet. Made
in Hong Kong, Serial Number A088634. Also seen Serial No. A168136 and 206183 (with IC date code 7710 and a slightly different battery door design). |
||
|
Comments:
|
Quite cheerful colour scheme. One of two calculators to say they are a Texet 880. Same calculator as many other clones - see same calculator. The logic is a bit confusing with three different cancel keys, seven digit negative numbers and is further let down by the pseudo fixed decimal bug. |
| Components: | 1 x CPU: Texas Instruments
TMS0972NL KBTP 7749 (date code week 49 of 1977), 28 pin DIL 0.3"
width black plastic 1 x LED display: eight digit with integral bubble lens, NS A1188 721 |
| Boards: | The main board (880 Rev B 0572 010876 1D11) 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. (CA) appears to clear all, even the memory - by the way (CS) is Change Sign |
| Overflow on number input is suppressed, keying in a ninth digit is ignored | |
| Negative numbers are flagged by a "-" sign in the immediate left digit but as there is no ninth digit you are limited to seven digit negative numbers: If you type in (1)(2)(3)(4)(5)(6)(7)(8)(CS), this will result in an error which is not recoverable as a first entry | |
| An overflow error is flagged with the result flashing and is recoverable using (CE) | |
| Divide by zero results in a flashing "0." and is recoverable using (CE) | |
| There is automatic constant on all functions | |
| There is no indication of memory store - you have to remember it | |
| Overflow in memory results in your input number flashing and is not recoverable: either use (C)(C) or (CA) to clear - and the memory contents are lost | |
| It suffers the pseudo fixed decimal bug: key in (1)(+)(1)(.)(0)(0)(=) to get "2.00" which remains a two digit decimal until you need more or use multiply or divide | |
|
|
|
|
|
| Box for
serial number 206183 Measuring 160mm by 90mm by 30mm this bold orange 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. Made in Hong Kong
|
Manual
for serial number 206183 Measuring 62mm by 134mm, 4 page black only. About as cheap as you can make a manual. Made in Hong Kong |
Service
Certificate and registration card (never filled in) for 206183.
It states that all defective units should be returned to Zeta Services, Chapter Street, Manchester M10 6AY. There was a £0.95 handling and return postage charge. It is wider than the box, so must have been handed out separately. |
Box for (later)
serial number A088634 Measuring 160mm 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. Made in Hong Kong
|
People who like this page also liked to visit buy the manual
