Charles Babbage developed the first plans for the difference engine in 1821:
Babbage developed two mechanical calculators, the difference engine and the analytical engine. During his lifetime he could, however, not build a functional engine but the latter served as the predecessor of the modern computer. His interests and activities reach far beyond pioneering work in this field.
Digger is a Canadian computer game released by Windmill Software in 1983, popular in the era of the IBM PC with a CGA graphics card and monitor. It generally requires a genuine CGA card and runs too fast on computers faster than the original IBM PC 4.77 MHz.