Related Clues:
- Obsolete PC operating system
- "Giant Brain" of 1946
- Early success for Bill Gates
- 1940s ''Giant Brain''
- PC progenitor
- Computing machine displayed in part at the Smithsonian
- Postwar digital marvel
- Big 1940s computer
- '40s-'50s 'Giant Brain'
- '40s-'50s "Giant Brain"
- Laptop's '40s ancestor
- “Giant brain” completed in 1945
- High-tech 1940s acronym
- Computer that was retired in 1955
- It worked with a prompt