It was a very common thing until the world settled into PC vs Mac for the most purposes, until tablets and phones came to be.
No, it was the common thing till the introduction in the 1960s of the IBM 360 line of computers (which shared the same instruction set and operating systems).
No, it was the common thing till the introduction in the 1960s of the IBM 360 line of computers (which shared the same instruction set and operating systems).