 | |
 An IBM 704 mainframe at NACA in 1957 | |
| Type | Mainframe/ scientific computer |
|---|---|
| Release date | 1953 |
| Successor | IBM 8000 (not released) IBM System/360 |
| Related | IBM 1400 series |
| History of IBM mainframes, 1952–present |
|---|
| Market name |
| Architecture |
The IBM 700/7000 series is a series of large-scale (mainframe) computer systems that were made by IBM through the 1950s and early 1960s. The series includes several different, incompatible processor architectures. The 700s use vacuum-tube logic and were made obsolete by the introduction of the transistorized 7000s. The 7000s, in turn, were eventually replaced with System/360, which was announced in 1964. However the 360/65, the first 360 powerful enough to replace 7000s, did not become available until November 1965. Early problems with OS/360 and the high cost of converting software kept many 7000s in service for years afterward.