AKA: ELSI MINI, AKA (Label): EL-801, Product number (P/N): EL801 (EL-801),
Keywords/Tags: EL801 (EL-801) | 801 | ELSI MINI
Date of intro: 1972, Origin: Japan (List), Dimensions: 97x67x22mm, Weight: 172g,
Power: 6V: (AA x4), Adaptor: SHARP_adaptors: EL90,
Display: Type = Display (LED) (List), Digits = 8+1,
Number of keys: 17,
Keyboard Array (Rows x Columns): 05x04, Keyboard Layout: [C] - [7] [8] [9] [-=] - [4] [5] [6] [(Division)] - [1] [2] [3] [x] - [0] [K] [.] [+=],
Classification: / Pocket,
Featuring: Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Related with: (Docu_Articles): 197402: Le Guide Pratique Des Calculatrices de Poche; SHARP_docu: (Broch.) *: (J) version-2; (Docu_Articles): 198010: Evolution of calculators,
Main Components: TOSHIBA: T1271; TOSHIBA: T3103,
Original Equipment Manufacturer : SHARP: EL801 (List of all Export-OEM-models from SHARP), Resemblance with: PRINZTRONIC: Micro,
Known Serial-numbers: 200357X | 2013027 | 2035470 | 203665X | 206156X | 3009185 | 3044023 | 3055271 | 3071123 (List of all S/Ns from SHARP)
Initial Cost Price: 39000 JPY (€ 315,90), Collector value: 8/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Info: DUDEK Emil:
Very early compact and solid feeling calculator with the best type of LED display.
I never did understand the battery indicator idea - just as you batteries are running low then an extra LED lights up to drain them even more!
Archaic logic with negative zero, pseudo fixed decimal and trailing zero bugs make it annoying to use but an early classic compact calculator all them same.
The strap can be put through a gap in the top.
Inside is marvellous; extreme high density components and connecting blocks to take the whole thing apart - wow!
The primary cpu board (4073PWB-A) is attached to the display board (4083PWB-A) via a 26-way block connector and is connected to the keyboard assembly by another 13-way block connector. This modular system allows a higher ‘stacked’ density as well as making servicing very easy.
Construction:
Undo the screw on the top side and the rear of teh calculator will easily lift off.
Logic comments:
The [C]-key is used to clear the calculator there is no cancel entry function.
Input overflow is not suppressed inputting a ninth digit results in all eight decimal points alight and is not recoverable.
Negative numbers are shown with a ‘-‘ to the far right of the digits thereby allowing full eight digit negative numbers.
There is selectable constant on multiply and divide by pressing [K]
An LED lights up by the letter K to remind you.
Divide by zero shows ‘........’ and is not recoverable.
Overflow shows ‘........’ and is not recoverable.
Interestingly, the results of a division do not have trailing zero suppression...
key in [9] [/] [5] and you get ‘1.8000000’ which continues into the next calculations.
The logic is reverse polish notation so takes a bit of getting used to:
to work out 9-5 key in [9] [+=] [5] [-=] which shows ‘4’
This calculator suffers the negative zero bug:
Key in [1] [+=] [2] [-=] to give ‘-1’ then add one by [1] [+=] to give ‘-0’
This calculator suffers the pseudo fixed decimal bug:
key in [1] [+=] [0] [.] [0] [0] [0] [+=] and the play will show ‘1.000’ which will remain until a calculation causes it to be exceeded.
Internet: Link-1: SCHLEPPTOPS Rechnerwiki, Link-2: DENTAKU MUSEUM