Most minimalistic (RPN) calculator
03-24-2020, 05:27 PM (This post was last modified: 03-24-2020 05:28 PM by Maximilian Hohmann.)
Post: #1
 Maximilian Hohmann Senior Member Posts: 891 Joined: Dec 2013
Most minimalistic (RPN) calculator
Hello!

Recently I acquired a "lot" of calculators, which also included a (boxed! and seemingly unused) "National Semiconductor Model 600 Personal Calculator". Made in USA in 1973 or 1974.

I think this must be the most minimalistic calculator in my collection. Six digits, integer arithmetic, no key for a decimal point. The "+" key performs the (unlabeled) Enter function as in similar units. The little "decimal" switch on top of the keyboars is really a gimmmick because it only turns on and off a fixed decimal point LED between the second and third digit from the right.

Does anybody have an even simpler (RPN) calculator?

Regards
Max

03-24-2020, 08:07 PM
Post: #2
 toml_12953 Senior Member Posts: 1,746 Joined: Dec 2013
RE: Most minimalistic (RPN) calculator
(03-24-2020 05:27 PM)Maximilian Hohmann Wrote:  Hello!

Recently I acquired a "lot" of calculators, which also included a (boxed! and seemingly unused) "National Semiconductor Model 600 Personal Calculator". Made in USA in 1973 or 1974.

I think this must be the most minimalistic calculator in my collection. Six digits, integer arithmetic, no key for a decimal point. The "+" key performs the (unlabeled) Enter function as in similar units. The little "decimal" switch on top of the keyboars is really a gimmmick because it only turns on and off a fixed decimal point LED between the second and third digit from the right.

Does anybody have an even simpler (RPN) calculator?

Regards
Max

Wow! that is minimal! Integer only - so if you press 1, +, 3, ÷ you get 0?

Tom L
Cui bono?
03-24-2020, 08:34 PM
Post: #3
 Maximilian Hohmann Senior Member Posts: 891 Joined: Dec 2013
RE: Most minimalistic (RPN) calculator
Hello!

(03-24-2020 08:07 PM)toml_12953 Wrote:  Wow! that is minimal! Integer only - so if you press 1, +, 3, ÷ you get 0?

Yes, just tried it out. And if the "decimal" switch is turned on, you get "____._0" as result istead :-) I wonder why anybody would want to use such a device, even in 1973.

Regards
Max
03-24-2020, 10:44 PM
Post: #4
 Steve Simpkin Senior Member Posts: 605 Joined: Dec 2013
RE: Most minimalistic (RPN) calculator
(03-24-2020 08:34 PM)Maximilian Hohmann Wrote:  Hello!
(03-24-2020 08:07 PM)toml_12953 Wrote:  Wow! that is minimal! Integer only - so if you press 1, +, 3, ÷ you get 0?
Yes, just tried it out. And if the "decimal" switch is turned on, you get "____._0" as result istead :-) I wonder why anybody would want to use such a device, even in 1973.
Regards
Max

Why? Price. With all of these cost saving measures, this must have been one of the cheaper models available at the time. I saw listings where it was advertised at US$24.99 in April 1974 and was on sale for$14.99 by November. And if you only needed it for balancing your checkbook or very basic math, it would work for that.

I remember looking at limited models like this around 1973-1974 as I was trying to convince my mother that me buying an electronic calculator would not ruin my ability to do math with pencil and paper. Those were dark ages indeed.

https://www.keesvandersanden.nl/calculators/ns600.php
03-25-2020, 05:04 PM
Post: #5
 Craig Bladow Senior Member Posts: 323 Joined: Apr 2016
RE: Most minimalistic (RPN) calculator
The Commodore Minuteman 6X has the same features. The 'Enter' key has the same functionality as the '+=" key.

CC41 coming soon!
03-25-2020, 07:24 PM
Post: #6
 Eddie W. Shore Senior Member Posts: 1,225 Joined: Dec 2013
RE: Most minimalistic (RPN) calculator
I think we have a winner.
03-26-2020, 10:06 AM
Post: #7
 Maximilian Hohmann Senior Member Posts: 891 Joined: Dec 2013
RE: Most minimalistic (RPN) calculator
(03-25-2020 07:24 PM)Eddie W. Shore Wrote:  I think we have a winner.

The Commodore hsa one key more :-)
03-26-2020, 12:21 PM
Post: #8
 rprosperi Senior Member Posts: 4,957 Joined: Dec 2013
RE: Most minimalistic (RPN) calculator
(03-26-2020 10:06 AM)Maximilian Hohmann Wrote:
(03-25-2020 07:24 PM)Eddie W. Shore Wrote:  I think we have a winner.

The Commodore hsa one key more :-)

Who would have guessed an ENTER key would be considered a frilly, unnecessary key on an RPN calculator?

--Bob Prosperi
03-26-2020, 01:27 PM
Post: #9
 toml_12953 Senior Member Posts: 1,746 Joined: Dec 2013
RE: Most minimalistic (RPN) calculator
(03-26-2020 12:21 PM)rprosperi Wrote:
(03-26-2020 10:06 AM)Maximilian Hohmann Wrote:  The Commodore hsa one key more :-)

Who would have guessed an ENTER key would be considered a frilly, unnecessary key on an RPN calculator?

You just have to clear the calculator and press + after the first entry. After all, it only has a two-level stack! I wouldn't want to use it now but it was a help back in the day, I'm sure. I don't know about the utility of a divide key on an integer-only calculator, though.

Tom L
Cui bono?
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