Sometimes you're rewarded for looking around in second hand shops. Today, I found this Casio personal-I calculator in mint condition!
Not bad for the princely sum of £2.00, yes two whole pounds. Since I like a bit of retro, I had to own it, although I'll probably use it. It will look great on my desk at work.
As you can see here:
...it was boxed (the box is in near perfect condition) and has the original instructions and batteries as well. I won't use the batteries, they're pretty old. The actual calculator was still in the protective plastic bag inside the box. It's in such perfect condition I don't think it has ever been switched on.
Of course, the buttons make that nice clicky noise that you only get from electronics of this era. I found more information about this model here.
I’ve bought a Brunsviga 18RK mechanical calculating machine, since it is a piece of computing history. Here it is:
It is awesome and I can report that everything seems to work. It can’t do negative numbers, so I have enjoyed doing things like entering 100 and then subtracting 150 to get a result of 9999999999950. That’s called underflowing the accumulator, and a bell rings when you do it.
In its honour, I have also written this C program:
int main(int argc, char *argv)
unsigned char test='A';
…which underflows an unsigned char, subtracting 66 from 65 to get a result of 255. For the sake of completeness I’m printing ACSII code 7 at the same time, so that a bell also sounds. I’m sorry.