Feature  

Description 

Case:  

Die-cast

Color case:  

Beige

Color keyboard:  

Grey

Weight:  

Voltage selection:  

Adapter:  

N/A

Power consumption:  

Working condition:  

Printed Circuit Boards (PCB's):  

PCB 01: 1000064
PCB 02+03+04+05+06: 1000066
PCB 07: 1000068
PCB 08+09+10+11: 1000070
PCB 12: AW3240
PCB 13+14+15+16: 1000072
PCB 17: 1000074
PCB 18: 1000076
PCB 19: 1000078
PCB 20: 1000080
PCB 21: 1000082
PCB 22: 1000084
PCB 23: 1000086
PCB 24: 1000088
PCB 25: 1000090
PCB 26: 1000092
PCB 27: 1000094
PCB 28+29: 1000096
PCB 30: 1000098
PCB 31: 1000100
PCB 32: 1000102

Memories:  

1 

Memories indication:  

Prog. steps:  

N/A

Decimal point handling:  

Rounding:  

Calculation overflow indication:  

Indicator on the right of the most right Nixie-tube.

Input overflow indication:  

Divide by Zero indication:  

Negative value indication:  

Indicator on the left of the most left Nixie-tube.

Constant function:  

Calculation speed:  

Auto Power-off:  

None 

Display details:  

The first 10 Nixie tubes (starting from the right side) are separated with 9 Neon bulbs,
which do have a 'decimal separator'-function.
Three plastic sliders can be used to clear up the result.

Printer:  

N/A

Extra features/remarks:  

First (electronic) calculator from IME,
one of the first electronic calculators containing transistors.
This machine is integrating 3.629 Components (EXCEL sheet) 
and has three registers, just like some old mechanical calculators.
The first register is the 'Input'-register (Red) which stores the input numbers entered on the keyboard.
The second register is the 'Result/Accumulating'-register (Green) which is holding the results for addition, subtraction, multiplication and power-calculation.
The third register is the 'Quotient/Invert'-register (Yellow) which is holding the quotient after division.
The memory service has three modes: memory for a number, memory for elemental calculations and memory as operation-counter.
After turning on the calculator, one has to wait app. 2 minutes before all Nixie-tubes are active, then it's advisable to press both [CM] [C] at the same time to be sure all registers are cleared.
The machine could be expanded with extra Console(s)

Initial price:  

DM 4.750

Overall quality rate (1-10):  

9

OEM-copies:  

-

Other sources of info:  

Disassembling the IME:84 / Pictures of the internals
Uni Stuttgart

Advertisements/Publications:  

Elektronik auf ihrem Schreibtisch

Key / Switch   

Description 

(Switch Upper Left Corner)  

Machine On/Off.

(Left Switch)  

Memory mode:
[GT] Grand Total, saves the results of calculations.
[  ] Saves the current number by pressing [IM]
[N] Saves the number of operations. 

(White key)  

Contents of memory.

(Yellow key)  

Contents of 'Quotient/Invert'-register.

(Red key)  

Contents of 'Input'-register.

(Green key)  

Contents of 'Result/Accumulating register'.

Nn  

Power calculation.

R  

Transfer from a result of a previous operation into the 'Input'-register,
the result can be found in the 'Result/Accumulating'- or 'Quotient/Invert'-register.

IM  

Transfer from the contents of the 'Input'-register into Memory.

RM  

Transfer from memory contents into the 'Input'-register.

(Left blue Key)  

Start of division calculation.

(Right blue Key)  

Transfer from the number to divide.

=  

Start of a multiplication.

CM  

Clear Memory.

C  

Clear registers.

CT  

Clear 'Input'-register.

+  

Transfer from the number to add.

-  

Transfer from the number to subtract.

*  

Start of a addition or subtraction.

Example

Operation

Display Result / remark

Addition:
123+456+789
 

  
[C]
123 [+] 456 [+] 789 [+] [*]

Subtraction:
789-456
 

  
[C]
789 [+] 456 [-] [*]

Mixed addition/subtraction:
555-320+150-450
 

  
[C]
555 [+] 320 [-] 150 [+] 450 [-] [*]

Multiplication:
15.65x450



 

[C]
15.65 [x] 450 [=]
[yellow key] 
[red key]
[green key]

Division:
1565.450:13.3
 

[C]
1565,450 [:] 13,3 [left blue key]

Power calculating:
12 Power 4

Memory Switch: [N]
[C]
12 [Nn]
12 [Nn]
12 [Nn]
12 [Nn]
[yellow key]
[white key]
[green key]