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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Pillow‏ @CounterPillow 16 Sep 2016
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      Replying to @marcan42 @Bobo_PK

      voltage regulator?

      1 reply 0 retweets 0 likes
    2. Hector Martin‏ @marcan42 16 Sep 2016
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      Replying to @CounterPillow @Bobo_PK

      No, that's the LM358 next to it buffering the 1/2Vdd...

      1 reply 0 retweets 1 like
    3. Bobo_PK‏ @Bobo_PK 16 Sep 2016
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      Replying to @marcan42

      wild, uneducated guess. Maybe it stored if the second RAM bank is active or not?

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 16 Sep 2016
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      Replying to @Bobo_PK

      No. It has *something* to do with vref but I have no idea *what*. It was broken and thus actively messing with it.

      1 reply 0 retweets 0 likes
    5. Bernd Walter‏ @bwalter01 16 Sep 2016
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      Replying to @marcan42 @Bobo_PK

      Protection diodes maybe. Just guessing however.

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 16 Sep 2016
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      Replying to @bwalter01 @Bobo_PK

      Doesn't make a lot of sense. Pinout was +3v3, GND, unk1, unk2, Vref, +1.5V. unk[12] were at 3.3V during normal operation

      2 replies 0 retweets 0 likes
    7. Bernd Walter‏ @bwalter01 16 Sep 2016
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      Replying to @marcan42 @Bobo_PK

      Currently my best guess would be something to ensure proper power sequencing.

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 16 Sep 2016
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      Replying to @bwalter01 @Bobo_PK

      Could be, or a monitor of some kind. But it's weird they'd need special sequencing for Vref... And it works without.

      1 reply 0 retweets 0 likes
    9. Bernd Walter‏ @bwalter01 16 Sep 2016
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      Replying to @marcan42 @Bobo_PK

      Power sequencing is to avoid latchup inside the chips. Can work or not, depending on the chips internal design.

      2 replies 0 retweets 0 likes
    10. Bernd Walter‏ @bwalter01 16 Sep 2016
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      Replying to @bwalter01 @marcan42 @Bobo_PK

      I assume pin 5 is the 358 output, so for power sequencing it shorts the output. Power sequencing doesn't make sense.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 16 Sep 2016
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      Replying to @bwalter01 @Bobo_PK

      5 is the 358 *input*, connected to a resistor divider over half the Vdd, so that would work.

      9:56 PM - 16 Sep 2016
      0 replies 0 retweets 0 likes

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