Weren't those old tills and adding machines great! I used to be mesmorised by them.
Is SPELL-CHECK as obsolete as this old adding machine?
Up until about 1960 everything could be taken apart by the curious and an understanding gained of how it worked. Then along came the microchip and the integrated circuit and devices became full of little black boxes that had hidden microscopic workings, the nature of which we must take on trust.