IBM System/360 Model 30

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IBM System/360 Model 30 at the Computer History Museum.

The IBM System/360 Model 30 was a popular IBM mainframe announced in 1964 across the world as the then least powerful of the System/360s – the first line of computers in the world to allow machine language programs to be written that could be used across a broad range of compatible sizes.

Basic Features[edit]

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.

System Configuration[edit]

A typical, early Model 30 system consisted of:[1][2]

  • IBM 2030 Central Processing Unit (64k storage)
with or without IBM 1401 System emulation feature
Using IBM 1316 Disk Pack


The IBM operating system used was usually the realistically sized DOS/360, rather than the larger OS/360. Programming was mostly in the COBOL, RPG and Assembler languages for the commercial applications that were the predominant uses of this computer, but Fortran could also be used for the scientific and engineering applications. COBOL programs for other computers could be run after recompiling on the System/360, except the input/output sections had to be re-written to relate to the System/360 devices through the DOS/360 DTF (Define the File) macros.

IBM 1400 Series Emulation[edit]

With the additional Compatibility Feature hardware and Compatibility Support software under DOS/360, the IBM 1401/1440/1460 object programs could be run in the emulation mode, with little or no reprogramming.[3] Many installations included the IBM 1401 compatibility feature, allowing older programs to be run.


The system was designed by IBM's General Systems Division in Endicott, New York, and manufactured in Endicott and other IBM manufacturing sites outside of U.S.

See also[edit]


External links[edit]