Sharp EL-8: Difference between revisions

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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 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|DG10L]] and 1x Itron [[Itron SP-8A|SP-8A]]), 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]].
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 ==
== Gallery ==

Revision as of 20:23, 15 July 2022

Sharp EL-8
Sharp EL-8.jpg
ManufacturerSharp
Introduced1970
Calculator
Display typeVFD
Display size8 digits
Programming
Other
Serial Numbers1012099

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 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

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.

Gallery

  • 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).

External Resources

  • []

See also

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