IBM mainframes are known for very unusual terminals. But IBM made many different things, including the IBM 3151 ASCII terminal, which uses a cartridge to emulate a VT220 terminal. [Norbert Keher] has ...

Mainframes entered the market in the early 1950's when IBM and the seven dwarfs (Burroughs, Unisys, NCR, Control Data, Honeywell, GE, and RCA) created the computing age and competed for critical ...