**Retro Review: Sharp Compet CS-2302 Review**

I’m going for a
little departure from the usual types of calculators I cover.

Sharp Compet CS-2302 |

Company: Sharp

Type: Adding Machine, Paperless

Years Made: 1970s

Batteries: AC Plug

I purchased the Compet CS-2302 from a local thrift store in
Glendora, CA back in the summer of 2016.

**Adding machine, but where’s the tape?**

The CS-2302 is a paperless desktop calculator, but retains the
characteristics of an adding machine.
That is to add numbers, enter your number and press [ + = ]. The total is immediately displayed. Same with subtraction, press [ - = ] to
subtract.

What is unusual about the CS-2302 is a lack of a subtotal or total
key (normally marked [ ⋄ S ] and [ * T ],
respectively). Totals are cleared by
pressing the clear button twice.

There is an exchange key [ ↕ ] on the CS-2302, something I don’t
ever recall seeing on an adding machine.

The CS-2302 has two memories, M and I. There are separate memory add and recall keys
dedicated to both memories.

The keyboard is very solid.
The keys are responsive and it was well maintained.

**The Very Bright Display**

The CS-2302 in a dark room |

I think the CS-2302 wins the award for having the brightest
display when it comes to calculators.

The Red Negative Indicator |

Even more amazing is the multi-color display. Yes, in 2017 we live in a world where
multi-color displays on calculators are close to common place: HP Prime, TI-84 Plus CE, TI-nSpire CX, Casio
Prizm, and Casio Classpad fx-CP400.
However, the CS-2302 is from the 1907s: a

**red negative sign indicator**.**Modes**

The usual adding machine modes are present: Constant Mode toggle (K), fix decimal
selector complete with Add Mode, and automatic summation (Σ) toggle.

If you are not familiar with Add Mode, it is a mode where the all
sums are rounded to 2 decimal places.
You are allowed to add and subtract numbers in dollars and cents without
having to press the decimal point key [ . ].
Add Mode is a favorite of many office workers.

**Item Counts, AVG, MU**

The Item Count adds the number of addition and subtraction
operations. Pressing [IC] gives the item
count and twice to clear it.

You can also use the item count to get the average of numbers
added by one step with the average key ([AVG]).
Calculating the average clears the item count automatically.

Sharp called the [MU] the multiple use key in the 1970s. Now the key is called the mark-up key. It is true that [MU] serves multiple
purposes. Looking at the manual from
similar desktop calculators from Sharp, the [MU] allows for cost, sell, markup,
margin, and percent change calculations. For example:

Percent Change: new [ + ]
old [ - ] [ MU ]

Selling Price: cost [ ÷ ]
margin [ MU ]

Markup: sell [ + ] cost [ -
] [ MU ]

**Final Verdict**

I love the display of the CS-2302 and the big size and steady
keyboard. I wish the CS-2302 had a
totals key [ * T ] to complete calculations.
This desktop calculator, and others like it, would be a good ecological
alternative for those who don’t want paper tape.

Eddie

This blog is property of Edward Shore, 2017

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