It was a computer Wang 2200 - see please http://en.wikipedia.org/wiki/Wang_2200 (a Russian version Искра-125 see the picture). I have created the first my simulator with it.
The BASIC of this computer has three operators
SELECT R (default, as in Mathcad now)
SELECT D (degree)
SELECT G (grad: 2pi=400 grad)
One my student has selected not SELECT D (for sin(45) etc) but SELECT G (G - градус [gradus] degree in Rusian).
It was very interesting to see, how this student has tried to debug a program 
It was also a good joke for 1-th April!
