Manufacturer: A/S BRDR. CARLSEN
Model: D31
AKA: CONTEX D31
Year: 1972
Display: Monolithic Nixie-tube (8 digit)
Circuits: ELECTRONIC ARRAYS
(see further on this page)
Dimensions: 215x205x68 mm
Power type: 220V
Origin: Denmark
S/N: 044003097
Owner: DEVIDTS Serge

 

Feature  

Description 

Case:  

 

Color case:  

 

Color keyboard:  

 

Weight:  

 

Voltage selection:  

 

Adapter:  

 

Power consumption:  

 

Working condition:  

 

Printed Circuit Boards (PCB's):  

 

Memories:  

 

Memories indication:  

 

Prog. steps:  

 

Decimal point handling:  

 

Rounding:  

 

Calculation overflow indication:  

 

Input overflow indication:  

 

Divide by Zero indication:  

 

Negative value indication:  

 

Constant function:  

 

Calculation speed:  

 

Auto Power-off:  

 

Display details:  

 

Printer:  

 

Extra features/remarks:  

This machine has the same functionality as the D11, plus memory.

Initial price:  

 

Overall quality rate (1-10):  

 

OEM-copies:  

 

Other sources of info:  

 

Advertisements/Publications:  

 

 

Another D31 version ^

Display ^



Internals ^

   

Internals: chips: ^
IC's from ELECTRONIC ARRAYS, also one small T.I.-chip (7218)

IC Number

Manufacturer

Code

1

ELECTRONIC ARRAYS

FDY: 150B-5005

2

 ELECTRONIC ARRAYS

FDY: 110B-5001

3

 ELECTRONIC ARRAYS

FDY: 320B-7002

4

 ELECTRONIC ARRAYS

FDY: 310B-7014

5

 ELECTRONIC ARRAYS

FDY: 360B-7006-1

6

 ELECTRONIC ARRAYS

FDY: 120-5013




Internals: keyboard-construction ^



Label (bottom) ^

A (D11 / D31 / D51) instruction manual is can be found on the D51 model.