Sharp EL-8: Difference between revisions

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(Created page with "{{Infobox calculator|name=Sharp EL-160|image=File:Sharp EL-8.jpg|manufacturer=Sharp|introduced=1970|display_type=VFD|display_size=8 digits|serial_numbers=1012099}} The '''Sharp EL-8''' was an early handheld calculator produced by Sharp. == Special features == Since the calculator uses the Itron font tubes it does not feature leading-zero supression, to help with readability (e.g. it would display '00000001' to display '1'). The calculator uses separ...")
 
m (add links to external resources section)
 
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{{Infobox calculator|name=Sharp EL-160|image=File:Sharp EL-8.jpg|manufacturer=Sharp|introduced=1970|display_type=VFD|display_size=8 digits|serial_numbers=1012099}}
{{Infobox calculator|name=Sharp EL-8|image=File:Sharp EL-8.jpg|manufacturer=Sharp|introduced=1970|display_type=VFD|display_size=8 digits|serial_numbers=1012099|other_names=Facit 1111, ADDO-X 9364}}


The '''Sharp EL-8''' was an early handheld calculator produced by [[Sharp]].
The '''Sharp EL-8''' was an early handheld calculator produced by [[Sharp]] starting around December 1970.


== Special features ==
== Special features ==
Line 9: Line 9:


== Internal design ==
== Internal design ==
The calculator uses 2 PCBs internally, one is the logic board, and the other is for the display and power supply, both seat into a card-edge connector mounted to the keypad assembly.
The calculator uses 3 PCBs internally, one for the logic, one for the display, and another for the power supply, the logic board and display board slot into a card-edge connector mounted to the keypad assembly, with the power board being connected to the display board via a wired connector and mounted with screws.


The calculator uses a [[reed switches|reed-switch]] keypad, [[:Category:VFD|Vacuum Fluorescent Displays]] (8x Itron [[Itron DG10L|DG10:]] and 1x Itron [[Itron SP-8A|SP-8A]]), and 4 [https://en.wikipedia.org/wiki/Integrated_circuit Integrated Circuits], the [[Rockwell]] [[Rockwell DC1152|DC1152]], and the [[Rockwell NRD2256|NRD2256]].
The calculator uses a [[reed switches|reed-switch]] keypad, [[:Category:VFD|Vacuum Fluorescent Displays]] (8x Itron [[Itron DG10L|DG10L]] and 1x Itron [[Itron SP8A|SP8A]]), and 9 [https://en.wikipedia.org/wiki/Integrated_circuit Integrated Circuits], the [[Rockwell]] [[Rockwell AC2261|AC2261]], [[Rockwell AU2271|AU2271B]], [[Rockwell DC1152|DC1152A]], [[Rockwell NRD2256|NRD2256]], the [[Hitachi]] [[Hitachi HD3121|HD3121]], and the [[NEC]] [[NEC UPD190C|μPD190C]].


== Gallery ==
== Sharp EL-8 ==
The Sharp EL-8 came in the colors black and white.
 
=== Gallery ===
<gallery perrow="0" widths="350" heights="350">
File:Sharp EL-8.jpg|Powered on.
File:Sharp EL-8 Bottom Shell.jpg|Bottom case.
File:Sharp EL-8 Badge (1012099).jpg|Badge (#1012099).
File:Sharp EL-8 internals (Rear).jpg|Rear of internals (with battery-bypass capacitor mod).
File:Sharp EL-8 internals (Rear 2).jpg
File:Sharp EL-8 internals (Front).jpg|Front of the internals.
File:Sharp EL-8 internals (Powered on).jpg
File:Sharp EL-8 internals (Powered on without the display cage).jpg|Powered-on without the display cage, there is copper tape against the back of the tubes and without the tape having a connection to ground the tubes will light dimly and unevenly.
File:Sharp EL-8 Keypad (Top).jpg|Top of the keypad cage.
File:Sharp EL-8 Keypad (Bottom).jpg|Bottom of the keypad cage.
File:Sharp EL-8 Display Assembly (Top).jpg|Display board assembly.
File:Sharp EL-8 Logic Board (Top).jpg|Top of the logic board.
File:Sharp EL-8 Logic Board (Bottom).jpg|Bottom of the logic board.
File:Sharp EL-8 Power Supply (Top).jpg|Top of the power supply board.
File:Sharp EL-8 Power Supply (Bottom) with Battery Bypass Capacitor Mod.jpg|Bottom of the power supply board (with battery-bypass capacitor mod).
</gallery>
 
=== Carrying case ===
The Sharp EL-8 came with a carrying case, the zipper latches shut and the carrying handle can button into 2 positions, with the handle extended or retracted.
<gallery perrow="0" widths="350" heights="350">
File:Sharp EL-8 Carrying Case (Top).jpg|Front
File:Sharp EL-8 Carrying Case (Side).jpg|Side, showing buttons
</gallery>
 
=== Sharp EL-81 Power brick ===
The Sharp EL-8 came with a Sharp EL-81 power brick for charging and powering the calculator.
<gallery perrow="0" widths="350" heights="350">
File:Sharp EL-81 Power Brick.jpg|Top of the power brick
File:Sharp EL-81 Power Brick (Bottom).jpg|Bottom of the power brick
</gallery>
 
=== EL-84 Battery ===
The Sharp EL-8's battery pack is a 7.2v rechargable nickel-cadmium (NiCad) pack made up of 6 AA-sized cells.
<gallery perrow="0" widths="350" heights="350">
File:Sharp EL-84 Battery pack.jpg|Sharp EL-84 Battery pack
</gallery>
 
== Facit 1111 ==
<gallery perrow="0" widths="350" heights="350">
<gallery perrow="0" widths="350" heights="350">
File:Sharp EL-8.jpg|Powered on
File:Facit1111 Top.jpg|The front of a Facit 1111
</gallery>
 
== ADDO-X 9364 ==
 
== Battery-bypass capacitor mod ==
To bypass the requirement of the battery pack you can put a capacitor across the battery terminals, a 470uf 16v cap is approximately what you want.
<gallery perrow="0" widths="326" heights="200">
File:Sharp EL8 Battery Bypass Capacitor.jpg|Battery-bypass capacitor in a Facit 1111
</gallery>
</gallery>
This mod uses D-SUB pins ("nixie pins") soldered to the capacitor, and the capacitor hot-glued in-place of the battery, to make the mod reversible.


== External Resources ==
== External Resources ==
* []
* [https://www.oldcalculatormuseum.com/sharpel-8.html Sharp EL-8 on The Old Calculator Museum]
* [http://www.vintagecalculators.com/html/sharp_el-8.html Sharp EL-8, Facit 111, and Addo-X 9364 on the Vintage Calculators Web Museum]
* [http://www.datamath.org/Related/Sharp/EL-8.htm Sharp EL-8 on the Datamath Calculator Musem]
* [http://www.johnwolff.id.au/calculators/Sharp/EL8-8M/EL8-8M.htm Sharp EL-8, EL-8M on John Wolff's Web Museum]


== See also ==
== See also ==
* [[Facit 1111]]
* [[Sharp EL-160]]
* [[Sharp EL-160]]


[[Category:Pocket calculator]]
[[Category:Pocket calculator]]
[[Category:Vintage calculator]]
[[Category:Sharp]]
[[Category:Sharp]]
[[Category:VFD]]
[[Category:VFD]]

Latest revision as of 09:49, 22 September 2023

Sharp EL-8
Sharp EL-8.jpg
Other namesFacit 1111, ADDO-X 9364
ManufacturerSharp
Introduced1970
Calculator
Display typeVFD
Display size8 digits
Programming
Other
Serial Numbers1012099

The Sharp EL-8 was an early handheld calculator produced by Sharp starting around December 1970.

Special features[edit | edit source]

Since the calculator uses the Itron font tubes it does not feature leading-zero supression, to help with readability (e.g. it would display '00000001' to display '1').

The calculator uses separate 'minus equals' and 'plus equals' keys, as well as a single key for multiplication and division, this was common for the time period.

Internal design[edit | edit source]

The calculator uses 3 PCBs internally, one for the logic, one for the display, and another for the power supply, the logic board and display board slot into a card-edge connector mounted to the keypad assembly, with the power board being connected to the display board via a wired connector and mounted with screws.

The calculator uses a reed-switch keypad, Vacuum Fluorescent Displays (8x Itron DG10L and 1x Itron SP8A), and 9 Integrated Circuits, the Rockwell AC2261, AU2271B, DC1152A, NRD2256, the Hitachi HD3121, and the NEC μPD190C.

Sharp EL-8[edit | edit source]

The Sharp EL-8 came in the colors black and white.

Gallery[edit | edit source]

  • Powered on.

  • Bottom case.

  • Badge (#1012099).

  • Rear of internals (with battery-bypass capacitor mod).

  • Sharp EL-8 internals (Rear 2).jpg

  • Front of the internals.

  • Sharp EL-8 internals (Powered on).jpg

  • Powered-on without the display cage, there is copper tape against the back of the tubes and without the tape having a connection to ground the tubes will light dimly and unevenly.

  • Top of the keypad cage.

  • Bottom of the keypad cage.

  • Display board assembly.

  • Top of the logic board.

  • Bottom of the logic board.

  • Top of the power supply board.

  • Bottom of the power supply board (with battery-bypass capacitor mod).

Carrying case[edit | edit source]

The Sharp EL-8 came with a carrying case, the zipper latches shut and the carrying handle can button into 2 positions, with the handle extended or retracted.

  • Front

  • Side, showing buttons

Sharp EL-81 Power brick[edit | edit source]

The Sharp EL-8 came with a Sharp EL-81 power brick for charging and powering the calculator.

  • Top of the power brick

  • Bottom of the power brick

EL-84 Battery[edit | edit source]

The Sharp EL-8's battery pack is a 7.2v rechargable nickel-cadmium (NiCad) pack made up of 6 AA-sized cells.

  • Sharp EL-84 Battery pack

Facit 1111[edit | edit source]

  • The front of a Facit 1111

ADDO-X 9364[edit | edit source]

Battery-bypass capacitor mod[edit | edit source]

To bypass the requirement of the battery pack you can put a capacitor across the battery terminals, a 470uf 16v cap is approximately what you want.

  • Battery-bypass capacitor in a Facit 1111

This mod uses D-SUB pins ("nixie pins") soldered to the capacitor, and the capacitor hot-glued in-place of the battery, to make the mod reversible.

External Resources[edit | edit source]

See also[edit | edit source]

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