To LUGNET HomepageTo LUGNET News HomepageTo LUGNET Guide Homepage
 Help on Searching
 
Post new message to lugnet.robotics.handyboardOpen lugnet.robotics.handyboard in your NNTP NewsreaderTo LUGNET News Traffic PageSign In (Members)
 Robotics / Handy Board / 7637
7636  |  7638
Subject: 
Re: handy board troubles...
Newsgroups: 
lugnet.robotics.handyboard
Date: 
Tue, 21 Mar 2000 22:03:12 GMT
Viewed: 
1298 times
  
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.



Message is in Reply To:
  Re: handy board troubles...
 
(...) 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)

12 Messages in This Thread:



Entire Thread on One Page:
Nested:  All | Brief | Compact | Dots
Linear:  All | Brief | Compact
    

Custom Search

©2005 LUGNET. All rights reserved. - hosted by steinbruch.info GbR