We all know the layout of the HP-35 of 1972:
Shortly after it, TI launched its SR-50:
While the order of the arithmetic keys on the SR-50 follows a simple logic, I can't comprehend the order on the HP-35. OTOH, HP kept it until 1981, so there must have been some reason. Anyone of the experts here got an idea?
BTW, both pictures show quite well the bad contrast of ÷ vs. + though that's another story.
d:-?