Related Clues:
- 'Abort, Retry, Fail?' software
- Vacuum tube innovation of 1946
- Computer that weighed 30 tons
- Product of the Army's Project PX
- PC format of old
- Seminal supercomputer
- Subject of the documentary 'Top Secret Rosies: The Female Computers of W.W. II'
- Large 1940s computer
- Passé PC system
- 'Giant Brain' of 1940s headlines
- Windows progenitor
- Ancestor of Windows
- PC platform with command lines
- IBM release of 1981
- Pre-Windows PC platform