Author Topic: 1973 Sharp ELSI 804 Calculator  (Read 347 times)

Offline Duffy

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1973 Sharp ELSI 804 Calculator
« on: March 14, 2017, 03:54:55 AM »
Picked up this 1973 Sharp ELSI 804 Calculator for a $1.00 at the ReStore. It works great. Give it a good cleaning, now it looks good as new. Some before and after pictures. The power cord on it is almost 8' long. It would look good on a older desk setup with a 70's 500 phone beside it.
« Last Edit: March 14, 2017, 04:55:14 AM by TelePlay »
CDN Doug

Offline twocvbloke

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Re: 1973 Sharp ELSI 804 Calculator
« Reply #1 on: March 14, 2017, 12:29:55 PM »
Odd that they put the Equals on both the Add and Subtract buttons, but I guess the design for that never hung around for long given that calculators since then have had the three functions separated... :)

Online Jim S.

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Re: 1973 Sharp ELSI 804 Calculator
« Reply #2 on: March 14, 2017, 01:46:57 PM »
Odd that they put the Equals on both the Add and Subtract buttons, but I guess the design for that never hung around for long given that calculators since then have had the three functions separated... :)
It may be for reverse Polish notation.
I am a bit rusty on reverse polish, ISTR it compares like this:
5-3=2 Standard notation
5+3-=2 Reverse Polish Notation
Jim S.
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You die, you forget it all.

Offline Duffy

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Re: 1973 Sharp ELSI 804 Calculator
« Reply #3 on: March 14, 2017, 02:34:17 PM »
I found a link with some information about this calculator.

http://www.oldcalculatormuseum.com/sharpel804.html
CDN Doug

Offline rdelius

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Re: 1973 Sharp ELSI 804 Calculator
« Reply #4 on: March 14, 2017, 09:47:50 PM »
RPN calculators have no = key and an enter key .have used an HP35 for about 40 years

Online Jim S.

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Re: 1973 Sharp ELSI 804 Calculator
« Reply #5 on: March 14, 2017, 10:32:49 PM »
RPN calculators have no = key and an enter key .have used an HP35 for about 40 years
I may not remember how RPN works, but I can "figure it out/re-remember it" when needed.
You live, You learn,
You die, you forget it all.

Offline Duffy

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Re: 1973 Sharp ELSI 804 Calculator
« Reply #6 on: March 16, 2017, 03:50:15 PM »
I found the same one on eBay. All I can say is "WOW" and I thought that selling mine for $20.00 CDN was to much.

http://www.ebay.com/itm/Vintage-Sharp-ELSI-804-Calculator-Works-Ships-Worldwide/152473492182
CDN Doug