Sunday, August 8, 2021

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

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