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 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.





Vintage Casio fx370B Scientific Calculator With 8 Digits LCD Display

A fully functional Vintage Casio fx370B Scientific Calculator With 8 Digits LCD Display use just one CR2032 lithium ion battery. A slight dent in the aluminium face plate above the "log" key.  All keys works. The LCD display is clear and sharp. The battery compartment is clean thanks to the lithium ion battery which are usually leak proof.

Battery cover removed to show the lithium ion battery CR2032

Battery cover and battery remove to show battery contacts.

Vintage Casio fx-120 10 Digit Scientific Calculator With Green VFD Display

A fully functional though slighly worn Casio fx-120 scientific calculator with green vacuum flourescent display.Need just 2 AA size alkaline battery.

10 Digit Green VFD In Casio fx-120 Scientific Calculator

Battery terminals are clean.

The calculator is fully functional. All keys has a good tactile feel. The back of the case is a little yellow with age. Minor scratches on the front and back.





Casio Pocket Mini P-812

This tiny calculator needs just ONE AA battery. Uses a Hitachi calculator chip. Keyboard not so sensitive but has a design similar to the Casio J3, a rugged keyboard. Pictures shows a cleaned Casio P812 pocket min.

NOTE: To get a large detail picture, right mouse clicked over the image and open link in a new window.

Some more pictures of the Casio Pocket Mini P-812 Calculator

Closeup Pictures Show What The Naked Eye Cannot See