IBM System/360 Model 30

The IBM System/360 Model 30 was a popular IBM mainframe announced in 1964 across the world as the least powerful of the System/360 range of four compatible computers – the first range in the world to allow programs to be written that could be used across a range of computers. The Model 30 had a maximum main storage of 64K bytes; its CPU used an 8-bit microarchitecture with only a few hardware registers; everything that the programmer saw was emulated by the microprogram.