Calculated Industries Calculators: Memory Registers and Tape

Calculated Industries Calculators:  Memory Registers and Tape

Introduction

This post covers five Calculated Industries calculators:

Tradesman Calc - 4400

Construction Master 5 - 4050

Machinist Calc Pro - 4087

Pipe Trades Pro - 4095

ElectricCalc Pro - 5070

Memory Storage and Store Arithmetic

The calculators do not have storage arithmetic other than the independent memory register (M).   

Tradesman Calc - 4400	Construction Pro 5 - 4050	Machinist Calc Pro - 4087	Pipe Trades Pro - 4095	ElectricCalc Pro - 5070
M, registers 1 - 9	M only	M, registers 1 - 9	M, registers 1 - 9	M, registers 1 - 9
M+, M-	M+, M-	M+, M-	M+, M-	M+

Tape Memory

All the calculators listed except the ElectricCalc Pro has a tape listing memory.  The tape memory records all the arithmetic (+, -, x, ÷), percent (%), and parenthesis keystrokes.  For the square (x²) and square root (√), the numeric results are recorded.  The tape memory does not record any work involving any of the solver keys.

Tape Memory Controls

Clear the Tape:  [ On/C ] [ On/C ] (or do a Clear All)

Enter Tape Mode: [ Conv ] [ = ]

Scroll in Tape Mode: [ + ], [ - ]

Exit Tape Mode:  [ = ]

The table lists the number of steps can be stored:

Tradesman Calc - 4400	Construction Pro 5 - 4050	Machinist Calc Pro - 4087	Pipe Trades Pro - 4095
20	20	30	30

Sample Problems and Tape Memory

Problem 1:  1.99 x 50 + 100 =    (Result: 199.5)

All calculators return the same tape (spaces added for clarity):

01  1.99

02 x 50

03 + 100

TTL = 199.5

Problem 2:  4 1/2 in + 3 3/8 in =  (Result:  7 7/8 in)

All calculators return the same tape:

01   4 1/2 INCH

02 + 3 3/8 INCH

TTL = 7 7/8 INCH

Tape with arithmetic functions will work with units.

Problem 3:  ( 1.99 x 20 + 25 ) = + 10% =   (Result: 71.28)

Tradesman Calc (4400) tape:

01  ( 1.99

02  x 20

03  + ) 25

SUB = 64.8

05 +% 10

SUB % 71.28

TTL = 71.28

Pipe Trades Pro (4095) tape:

01  1.99    (first parenthesis is messing)

02  x 20

03  + ) 25

SUB = 64.8

05 +% 10

SUB % 71.28

TTL = 71.28

Construction Master 5 (4050) tape and 

Machinist Calc Pro (4087) tape:

The parenthesis are left out since neither of these calculators have parenthesis.  I have left the calculations in that order to ensure proper order of operations:

01  1.99    (first parenthesis is messing)

02  x 20

03  + 25

SUB = 64.8

05 +% 10

SUB % 71.28

TTL = 71.28

Problem 4:  15 x^2 x π  (Result:  706.85835)

All calculators return the same tape:

01 225   (shows 15^2)

02 x 3.141593

TTL = 706.85835

Problem 5:  24 x 59 = √   (Final Result:  √1416 = 37.62978)

All calculators return the same tape:

01 24

02 x 59 

TTL = 1416

The square root is totally ignored!

Problem 6:  24 √ x 59 √ =    (Result: 37.62978)

All calculators return the same tape...

01 4.898979 

02 x 7.681146

TTL = 37.62978

except the Trademsan Calc (4400) - sometimes:

01 24

02 x 7.681146

TTL = 37.62978   (this doesn't make sense!)

However, most of the time, I get the proper tape above.  This just a thing to watch out for.  

Note that √(24 * 59) = √24 * √59

Curious that none of the Calculator Industries finance and real estate calculators have the tape feature.  

The Recall Memory Feature:  Additional Calculations

The Recall Memory (Rcl) of the independent memory register returns three calculations:

TTL:  total or sum

AVG: average of all entries by M+

CNT:  count of all entries by M+

[ Rcl ] [ M+ ]: To display the contents of the independent register (total).

Keep pressing [ M+ ] to cycle through average, count, total.  Press [ On/C ] to exit.  

The notable exception is the ElectriCalc Pro:

[ Rcl ] [ 0 ]:  To display the contents of the independent register (total).

Keep pressing [ 0 ] to cycle through average, count, and total.  Press [ On/C ] to exit.  

Sample Data:

410, 359, 367, 388, 384

Recall memory M until it's cleared.  You can store 0 into Memory M or press RCL twice.  Insert presses of [ Conv ] when needed.  

410 M+

359 M+

367 M+

388 M+

384 M+

Note:  On the ElectriCalc Pro, press [ Stor ] [ M+ ] to use M+.

RCL M: 

TTL 1908  (TOTAL on the Machinist Calc Pro)

(Press M again)

AVG  381.6

(Press M again)

CNT  5   (COUNT on the Machinist Calc Pro)

(Press M again to cycle.)

That is a tour of the memory features on some of the industrial calculators from Calculated Industries.  Hope you find this useful!

Eddie

All original content copyright, © 2011-2021.  Edward Shore.   Unauthorized use and/or unauthorized distribution for commercial purposes without express and written permission from the author is strictly prohibited.  This blog entry may be distributed for noncommercial purposes, provided that full credit is given to the author. 

Using Grand Total and Independent Memory for Complex Invoicing

Using Grand Total and Independent Memory for Complex Invoicing 

Introduction

Portable desktop (usually solar powered) calculators usually have at least two memory registers:  independent memory (M) and grand total (GT).  

Adding calculations to the independent memory by pressing the memory plus key    [ M+ ].  

Adding calculations to the grand total by pressing the equals key [ = ]. 

Invoice with Taxable and Nontaxable Items

We have an invoice that has items that are subject to sales tax, and items and services that are exempt from sales tax. 

Take advantage of both the independent and grand total memories to calculate the total invoice.

Two approaches:

[ ON/C ] to clear the grand total memory

[ MC ] (or press [ MRC ] until the independent memory is cleared) 

Method 1: 

taxable items [ M+ ]

nontaxable items [ = ]

After finishing entering all the items, add sales tax:

[ MR ] [ × ] sales tax rate [ % ] [ M+ ]

Calculate the total invoice:

[ MR ] [ = ] [ GRAND TOTAL ]

Method 2:

taxable items [ = ]

nontaxable items [ M+ ]

After finishing entering all the items, add sales tax:

[ GRAND TOTAL ] [ × ] sales tax rate [ % ] [ = ]

Calculate the total invoice:

[ MR ] [ = ] [ GRAND TOTAL ]

The example will use Method 1.

An Example of an Invoice

Taxable Items:

$ 19.99

$ 39.96

$ 14.97

Nontaxable Items:  

$ 109.00

$  15.00

Sales Tax Rate:  9% 

As long as you keep your designation of what memory registers are used, you can enter each item in any order.  So both methods should work.

[ AC/ON ] [ MC ]

109 [ = ]

15 [ = ]

19.99 [ M+ ] 

39.96 [ M+ ]

14.97 [ M+ ]

[ MR ] [ × ] 9 [ % ] [ M+ ] 

[ MR ] [ = ] 

[ GRAND TOTAL ]

Result:  205.6628

[ AC/ON ] [ MC ]

109 [ = ]

19.99 [ M+ ] 

15 [ = ]

39.96 [ M+ ]

14.97 [ M+ ]

[ MR ] [ × ] 9 [ % ] [ M+ ] 

[ MR ] [ = ] 

[ GRAND TOTAL ]

Result:  205.6628

Invoice:  $205.66

The calculators I used for this example are the Casio JF-100BM and Casio MC-12M Shop Calculator.  

Eddie

All original content copyright, © 2011-2020.  Edward Shore.   Unauthorized use and/or unauthorized distribution for commercial purposes without express and written permission from the author is strictly prohibited.  This blog entry may be distributed for noncommercial purposes, provided that full credit is given to the author. 

Review: Casio MC-12M Shop Calculator

Review:  Casio  MC-12M Shop Calculator

Just The Facts:

Model:  MC-12M Shop Calculator 

Company: Casio

Type:  Desktop 

Display:  12 digits

Battery:  Solar and Battery (AA battery backup)

Logic: Chain

Memory:  Two:  M and Grand Total 

Double Zero Key

Web Site:  https://www.casio-intl.com/asia/en/calc/products/MC-12M/

I purchased this calculator several months ago at a WalMart for about $11.50. 

Features:

Cost/Sell/Margin Calculation

Change Function

Square Root

The display is set an angle so it is tilted towards the user.  I find the keyboard a pleasure to use.  My hands may be a little big, but with the right size of hands you can speed type on the MC-12M.   The keys are fast and responsive.  

Memory

There are two memories within the MC-12M:  the independent memory M and the Grand Total key.  

The independent memory works with the usual memory plus (M+) and memory minus (M-) keys.   The recall (MR) and clear memory (MC) keys are separate keys on the MC-12M.  

The grand total memory is activated every time you press the equals [ = ] key.  On the MC-12M, the grand total memory is automatic.   The grand total memory is cleared when either [AC/ON] is pressed or the calculator is turned off.  

The Change Feature

The big selling feature of the MC-12M Shop Calculator is the [CHANGE] button.   You enter an amount and press [CHANGE], like you were handed cash in a transaction.   When it is pressed, it compares the amount entered against the amount in the grand total memory registered.  The independent memory is not used in the change feature.  

Example:

You have a $100 bill (C-note) and purchase the following:

1 SD card for $19.95

1 desktop calculator for $11.49  ;)

3 reams of paper for $5.00 each (on sale)

15 pens at $0.49 each

2 USB drives, 32GB for $10.60 each

Sales Tax: 9%

Keystrokes:

[AC/ON]

19.95 [ = ]

11.49 [ = ]

3 [ × ] 5 [ = ]

15 [ × ] .49 [ = ]

2 [ × ] 10.60 [ = ]

[ GRAND TOTAL ]     (Display: 74.99)

[ × ] 9 [ % ] [ = ]

[ GRAND TOTAL ]     (Display/Total Invoice: 81.7391   [$81.74]  )

100 [ CHANGE ]   (Change: 18.2609  [$18.26] )

Percent Change

You can calculate percent change with the use of the minus and percent keys.

%CHG Keystrokes:   new [ - ] old [ % ]

Calculate the percent change from 14.75 to 19.85?

19.85 [ - ] 14.75 [ % ] 

Percent Change:  34.5762711864   (34.5762711864%)

Wishes and Verdict

There are two things the MC-12M Shop Calculator have:

Fix Decimal Selector:  This would be great for the shop because most currency calculations work with 2 decimal places.   My selection of choices would be 0, 1, 2, 3, 4, 6.

I would also like to see the Add Mode added. 

Since this is a shop calculator, I can imagine people using this calculator to calculator areas and volumes, so a π key would be nice.  

π ≈ 3.1415926535

This calculator is nice to operate and hold and yes, I like the square root (which should be present on more desktop calculators).   Worth a look.

Eddie

All original content copyright, © 2011-2020.  Edward Shore.   Unauthorized use and/or unauthorized distribution for commercial purposes without express and written permission from the author is strictly prohibited.  This blog entry may be distributed for noncommercial purposes, provided that full credit is given to the author.