15 lines
715 B
Markdown
15 lines
715 B
Markdown
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# RTC Apple Custom Silicon
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The RTC (Real-Time Clock) chip within the Macintosh SE is an Apple
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custom silicon chip that implements the real-time clock and
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battery-backed PRAM (Parameter RAM). Fortunately, its simplicity has
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yielded a fairly complete replacement chip design that is based around
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the pin-compatible ATTiny85 chip running appropriate firmware. See
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the `firmware` directory for details.
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Nevertheless, if we do get a microscopic chip scan of the original
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silicon, this directory would contain corresponding design files to
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replicate the original design as-is. Since the chip design is so
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simple, this might be easily doable with conventional DSLR macro
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photography after the packaging is opened up.
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