|Type:||Alphanumeric programmable scientific calculator|
|Batteries:||CR 2032 x 2|
|Notes:||This is IMHO the best and most usable programmable calculator
ever. The user interface is very good and clear, the display is fantastic
and its interfacing options are adequate. This calculator came in two versions,
the Casio fx-601p and the Casio fx-602p. The Casio fx-601 has 128 programming
steps, the Casio fx-602 has 512 programming steps, more than enough for most
tasks. This calculator is the successor to the non-alphanumeric Casio fx-501p
and Casio fx-502p. The 601p/602p calculators were available next to their
basic programmable brother the Casio fx-702p.
A rather funny 'function' of this calculator is its ability to play music using its cassette interface. A special keyboard overlay for this function was also available and part of the standard package. The manual even listed a couple of songs that could be played in this manner!
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 numbers exponent, otherwise it will enter the constant π.
Synthetic ProgrammingI've written a large number of programs for this calculator, some using all 512 steps of memory. Not many people know that "Synthetic Programming" is possible on this calculator by using a "mirror". The calculator had two working modes, alphanumeric and non-alphanumeric. The programming step to switch between the two modes is always automatically balanced, the step acts as a switch between the alphanumeric and non-alphanumeric mode. Now, to enter Synthetic Programming do the following:
(Just enter a large bulk of alphanumeric stuff, say 200 steps)
My programs used to be full with these. The "mirror" could be saved to tape as well.
BugsThere were some bugs in this calculator as well. To my mind come the following two:
SpeedAlthough this calculator is fast to begin with, it could easily be speeded up by simply changing the value of one of its internal resistors. Mine was at least twice as fast as it should be. I had to change batteries twice as often as well though...
Full ResetOne of the e-mails I receive every now and again goes something like this: "I have a Casio fx-602p and love it, but suddenly I only have only n programming steps left instead of the usual 512, and I can't add any more programs in MODE 2". Well, the solution to this little problem is a simple one. Type the following key sequence: "MODE", "1", "MODE", ".", "2", "0", "MODE", "3", "MAC" and everything should be back to normal. Please note that this will completely clear the calculator's memory and any user programs are lost as well.