Terminated: 1994
This calculator does not have a key to switch it off. Just close its sleeve or just wait.
These CONSTants can be called up by number. There is a list in its manual and the calculator comes with a sheet insert as well. For instance, 5 CONST will call up the gravitational constant "9.80665".
One hundred and twenty eight constants are quite a lot of constants, which creates room for unusual ones. So there is the very important "ptUK", the UK Pint, 3 4 CONST which is 5.6826241186 ml! And another number, the number 42 which is dear to me, 4 2 CONST is the metric carat, 2-4. Can that be a conincidence? I have no idea what a metric carat is though.
The BASE-n functionality of this calculator can work with 32-bit numbers, even in binary. When a binary result is displayed the . key (marked "BLOCK") can be pressed repeatedly to see all of its 4 bytes.
This scientific calculator runs on solar power, even very dim light is enough to power it (as you can see, the lamp of my scanner was enough to start it). It also has a backup lithium battery to safeguard the calculator’s memory. The calculator runs fine without the battery.
The calculator has rubber buttons that have an excellent feel. The whole look of the calculator is clean and neat in my opinion.
This calculator (as do many other CASIO scientific calculators) uses one and the same key for both the constant π as well as exponents. This works as follows. When you first enter digits, the EXP key will enable you to enter the exponent, otherwise it will enter the constant π.
Many thanks to Ronald van der Wiel for donating this calculator to the museum!