vmu with dead batteries resets maple w/ rumble. normal?

Discussion in 'Sega Dreamcast Development and Research' started by TerdFerguson, May 6, 2018.

  1. TerdFerguson

    TerdFerguson ls ~/

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    as the title says, if i try to use a rumble pack with a vmu with dead batteries (all mine are dead, those things die too quickly) the vmu will reset, resetting the port as a result and all input stops for a second

    is this normal system behavior? or is my maple bus not performing as it should? if i have 2VMUs, keyboard, mouse, and if i add a dreameye, my maple bus goes nuts and VMUs continuously reset

    surely the system should be able to power 8 VMUs, or at the very least a VMU and a rumble pack
     
  2. Xerxes3rd

    Xerxes3rd Rapidly Rising Member

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    I have observed that adding or removing a peripheral to the controller (such as a VMU) causes a reset due to a controller response timeout. I'm not sure if this resets the whole Maple bus, or just that controller's port.
     
  3. TerdFerguson

    TerdFerguson ls ~/

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    yes every dc does this AFAIK

    my post was asking if maple reset during normal use of one port was normal or not. a big name 1st party hardware developer wouldn't usually put out a peripheral that crashes the input bus

    it sucks because a pair of VMU batteries lasts MAYBE a week, and if you don't use the standalone VMU game features it doesn't last too much longer
     
  4. S4pph4rad

    S4pph4rad Site Supporter 2015

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    Does it really? I just checked my first VMU that I've had since 1999, and the stock battery that came with it is still alive.
    I would always put the little plastic tab back into the back of the VMU when I wasn't using it to cut power to the battery. Despite this, I did use it for standalone games like the Homebrew Tetris, so it wasn't completely unused.

    A week sounds like an exaggeration, the battery must've lasted longer than that under normal use.
     
  5. Xerxes3rd

    Xerxes3rd Rapidly Rising Member

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    Mine never seemed to last longer than a few weeks back when the DC was a current console. Now I don’t even bother to replace the VMU batteries since they die so quickly.
     
  6. AtomizerZero

    AtomizerZero Intrepid Member

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    Maybe someone should mod a lithium rechargeable into the vmu with a little charge circuit.
     
  7. TriMesh

    TriMesh Site Supporter 2013-2017

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    No, it's not normal - it's probably a bad connection somewhere. Try reseating the power supply and the flex cable going to the controller PCB.

    I did look into this once, and the biggest problem is that the rechargable coin cells like the MN2032 have about 1/4 of the capacity of the primary cell types. They are also designed to operate with very low discharge currents and suffer a drastic reduction in cycle life if discharged at higher rates.
     
    Last edited: May 12, 2018
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  8. TerdFerguson

    TerdFerguson ls ~/

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    yeah i've gotten like 12 batteries in bulk and the vmu would die after a week or two

    so as far as the maple bus goes, is it normal for a dead vmu + rumble pack reset the bus every time the pack rumbles?
     
  9. Xerxes3rd

    Xerxes3rd Rapidly Rising Member

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    I agree with TriMesh- does sound like you have issues with the 5V line of the power supply. I’ve seen some odd behavior in the past from (probably broken) 3rd-party jump packs, but I can’t remember if I saw the same thing you’re describing.
     
  10. TriMesh

    TriMesh Site Supporter 2013-2017

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    None of my consoles do that, using either the original Sega rumble pack or a third party one, and using either the Sega VMU or a third-party memory card.

    Although now I think about it, I have a vague memory of seeing that once before from a rumble pack with a bad motor in it that went short at one point in it's rotation.
     

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