Subject:
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Re: handy board troubles...
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 21 Mar 2000 22:03:12 GMT
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Viewed:
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1176 times
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In lugnet.robotics.handyboard, John Wynne writes:
> In lugnet.robotics.handyboard, Jake Burkholder writes:
> > In lugnet.robotics.handyboard, John Wynne writes:
> > > Actually Jake, I'm having a similar problem right now, with regard to
> > > loss of RAM capabilities.
> > >
> > > I've been testing a new Polaroid 6500 sonar (which now works!) on the HB
> > > and I've got it hooked up through the exp. board. I tried to run a simple
> Yes! I apologize, I meant "..._without_ the RJ11 cord connected..."
>
> Is it possible a surge could have fried the RAM and now it won't
> hold memory? That was my contention, but I'm not sure...
>
> John
>
> p.s. RAM replacement question: Will any 64K CMOS SRAM 28 pin chip work?
> I have a HM6264P-12 120ns RAM chip that I bought today, and was wondering if
> I might expect problems (due to difference from the recommended RAM chip)...
> Thanks!
Sorry about this, I meant 32K.
John
>
>
> > > program that used actuated two servos, two motors, while polling one analog
> > > input. It seemed to work without the Polaroid connected, but when I fired
> > > it up with everything loaded on, it died, and now my HB can't seem to hold
> > > it's RAM with the RJ11 cord connected to the charger/dler. I'm not • completely
> > ^^^^
> > Do you mean without? That's my problem; the board only holds its data if
> > the cord is plugged in.
> >
> > > sure how the servos are powered/oscillated (etc.) so I haven't been able
> > > to locate where I might have suffered some kind of power surge (possibly
> > > from the sonar ranging board)... does it make any sense to think that
> > > the sonar could have any affect on other periferals without being directly
> > > powered up?... How ARE the servos on the Exp. Board driven?
> >
> > I've also got a servo which I can't figure out how to drive from the
> > exp. board, but the problem of the RAM discharging happens even with a
> > bare board (no exp., no lcd).
> >
> > I'm convinced its a voltage problem and was going to try replacing the fuse
> > at F1 next.
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Message is in Reply To:
 | | Re: handy board troubles...
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| (...) Yes! I apologize, I meant "..._without_ the RJ11 cord connected..." Is it possible a surge could have fried the RAM and now it won't hold memory? That was my contention, but I'm not sure... John p.s. RAM replacement question: Will any 64K CMOS (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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