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Apple S1
This is r2 (the current revision), saved by jack. Full history
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Apple S1
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| Designer | Apple |
|---|---|
| Introduced | April 2015 (Apple Watch, 1st generation) |
| Type | System in Package (SiP) |
| CPU | Single-core, 520 MHz (32-bit) |
| Devices | Apple Watch (1st generation) |
| Successor | Apple S1P · Apple S2 |
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The Apple S1 launched the S series in the original Apple Watch in April 2015 — not a chip but a complete computer sealed into a single resin-encapsulated package: processor, memory, storage, sensors, and wireless, about thirty components in the space of a fingertip. The System-in-Package construction protected the electronics from water and dust and set the physical format every Apple Watch has used since.
1 Legacy✎
The S1's single 32-bit core was modest — the original Watch leaned on a paired iPhone for nearly everything — but the SiP idea it introduced became the S series itself. The first-generation Watch ended its software life at watchOS 4, the shortest run of any model.
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