History
Many vacuum tube computers had FRUs:
- Pluggable units containing one or more vacuum tubes and various passive components
Most transistorized and integrated circuit-based computers had FRUs:
- Circuit boards containing discrete transistors and various passive components. Some examples:
- IBM SMS cards
- DEC System Building Blocks cards
- DEC Flip-Chip cards
- Circuit boards containing monolithic ICs and/or hybrid ICs such as IBM SLT cards.
Vacuum tubes themselves are usually FRUs.
For a short period starting in the late 1960s some television manufacturers started making solid-state televisions with FRUs instead of a single board attached to the chassis. However all modern televisions put all the electronics on one large board to reduce manufacturing costs.
Read more about this topic: Field Replaceable Unit
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—Georg Wilhelm Friedrich Hegel (1770–1831)
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—Thomas Paine (1737–1809)