Vintage Casio S-1 Desktop Calculator

This Casio S-1 caculator is yellow with age, but is still operating well with good key pad.

A design error in the support for the battery terminals can

cause the thin plastic wall of the terminal to give way

due to pressure from the inserted batteries. When this happens

the battery loses contact and the calculator malfunction. A simple repair

is to place a strip of nylon tubing to reinforce the battery terminal wall.

 

The moulded model number on the case is  S-2 but this

is covered over with a label showing the calculator as a S-1.

 

Vintage Kokuyo KC-30A Wiseman Green VFD Calculator

Unusual 3.5 digits calculator with a counter function.

Why would someone want to have a calculator displaying only 3 digits at a time? It serves as a good counter though, just click on the count button to increase the count by one for whatever you are counting.

Includes a engraved rule on the back of the case with centimeters marks.

In good cosmetic condition, needs three AA size alkaline battery.

Vintage Canon Canola L1011 Calculator With 10 Digit Green VFD Display

A nice looking vintage Canon Canola calculator. Batteries are place just behind to the top of the 10 digits VFD display. 4 AA size battery adds some stability to this portable desktop calculator.. Case easily open via 2 screws in the battery compartment. Aluminium faceplate trim to the keypad created some issue with wear and tear possibly a result of the composition of the aluminium.

Vintage Adler D-122 Calculator With 12 Digit VFD Display

A fully functional Adler D122 calculator with 12 digits green VFD display.
The display is visible behind a green plastic window.

Adler seems to have taken care of any potential heating issues
by making grills in at the top end of the case.

The postive terminal of the battery compartment is
oxidised but good electrical contact is still possible.

Vintage Casio Mini Electronic Calculator CM-602

Any early Casio calculator, with quite a bit of components. To save cost Casio just display 6 digits. The keyboard uses metallic wires and a thin sheet of steel with multiple springy cutouts. A key problem with such a keyboard is key bounce and this has to be solved with either hardware or software. This particular Vintage Casio Mini Electronic Calculator CM-602 suffers from key bounce randomly, causing digits to repeat themselves even though the key is press only once.

Casio Mini CM 602 Calculator Made In Japan 1970s

 

The keypad would benefit from some cleaning maybe replacement
of the wires use for the fixed portion of the key contact. Currently the
keypad exhibits a good amount of key bounce resulting in repeated digits.