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Sharp Elsi Mate EL-8118 from the 70's in Japan: yet another VFD based calculator
02-28-2015, 08:46 AM
Post: #1
Sharp Elsi Mate EL-8118 from the 70's in Japan: yet another VFD based calculator
This unit is in reasonable condition for its age. The case is intact, except a tiny hair line close to the power adapter jack.

The calculator was used extensively, as the worn keyboard membrane shows, but all the keys still register fine as long as we press it firmly.

From the back engraved label:
Rating: (DC) 3V 0.3W
(Dry Battery SUM-3 x 2) 3V
(Rechargeable Battery EA-18B) 2.4V
Or (AC Adapter / Charger EA-17E) 3V
Sharp Corporation
Made in Japan

An additional very worn silver sticker label informs about the patents involved in the manufacturing process.
"Manufactured under one or more of the following patents:
USA ..... UK ..... CANADA ..... "

Hardware details:
- The VFD is bright as new, thanks for the installed excellent FUTABA 9-ST-12 unit.
- The high quality electrolytic capacitors are from Nichicon - They measure fine after more than 40 years!
- 28 DIP IC Hitachi HD37351 SoC, made in 1976 I believe.
- The high voltage transformer was made by TDK Japan.
- The current consumption on this unit is:
52mA after power on (only one digit lit).
65mA with all digits lit.



[Image: Sharp_EL-8118_001.jpg] [Image: Sharp_EL-8118_002.jpg] [Image: Sharp_EL-8118_003.jpg]

[Image: Sharp_EL-8118_005.jpg] [Image: Sharp_EL-8118_012.jpg] [Image: Sharp_EL-8118_014.jpg]

[Image: Sharp_EL-8118_016.jpg] [Image: Sharp_EL-8118_017.jpg] [Image: Sharp_EL-8118_024.jpg]

[Image: Sharp_EL-8118_025.jpg]

Jose Mesquita
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02-28-2015, 08:56 AM
Post: #2
RE: Sharp Elsi Mate EL-8118 from the 70's in Japan: yet another VFD based calculator
Some old school function keys here: MU, 5/4
Does anyone have a instruction guide or information on these kind of calculator functions?

[Image: Sharp_EL-8118_026.jpg] [Image: Sharp_EL-8118_028.jpg] [Image: Sharp_EL-8118_029.jpg]

[Image: Sharp_EL-8118_030.jpg] [Image: Sharp_EL-8118_031.jpg] [Image: Sharp_EL-8118_033.jpg]

Jose Mesquita
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02-28-2015, 01:33 PM (This post was last modified: 02-28-2015 01:34 PM by rprosperi.)
Post: #3
RE: Sharp Elsi Mate EL-8118 from the 70's in Japan: yet another VFD based calculator
(02-28-2015 08:56 AM)jebem Wrote:  Some old school function keys here: MU, 5/4
Does anyone have a instruction guide or information on these kind of calculator functions?

As I remember the "5/4" setting on Sharp Desktop calculators, but not what it meant, I just had to google a bit.

5/4 means "rounded off" - which is pretty ambiguous, since these same machines also had a "rounded down" and "rounded up" option. I presume this means truncated to the current number of display positions.

--Bob Prosperi
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02-28-2015, 02:41 PM (This post was last modified: 02-28-2015 02:42 PM by jebem.)
Post: #4
RE: Sharp Elsi Mate EL-8118 from the 70's in Japan: yet another VFD based calculator
(02-28-2015 01:33 PM)rprosperi Wrote:  5/4 means "rounded off" - which is pretty ambiguous, since these same machines also had a "rounded down" and "rounded up" option.

Thank you, Bob.
Following your pointer, I did some testing.

Indeed, in this model, if the 5/4 selector is set to 4 decimal places, I get these answers:
1/3 = 0.3333 (5th decimal digit value below 5, so round down)
1/6 = 0.1667 (5th decimal digit value equal or above 5, so round up)

And this is what I have learn at the engineering technical school in the 70's, but we didn't call it 5/4, so I was not associating it with the rounding rules at all.

Jose Mesquita
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02-28-2015, 11:06 PM
Post: #5
RE: Sharp Elsi Mate EL-8118 from the 70's in Japan: yet another VFD based calculator
Check with Katie on the instruction manual.
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