technoguy

The term "minicomputer" evolved in the 1960s to describe the "small" third generation computers that became possible with the use of transistor and core memory technologies. The term came in fashion about the same time as the miniskirt and mini cars. They usually took up one or a few cabinets the size of a large refrigerator or two, compared with mainframes that would usually fill a room. The first successful minicomputer was Digital Equipment Corporation's 12-bit PDP-8, which cost from US$16,000 upwards when launched in 1964.

savvytechno

They had a size of a refrigerator but today think about the technology advancement, now you can have this in your small shirt pocket.