Subject:
|
Re: Corrupted or Invalid Pcode?
|
Newsgroups:
|
lugnet.robotics.handyboard
|
Date:
|
Fri, 11 Jul 1997 15:54:55 GMT
|
Original-From:
|
Fred G. Martin <FREDM@stopspamMEDIA.MIT.EDU>
|
Viewed:
|
956 times
|
| |
|
|
James,
Thanks for following up.
The reason for this behavior should be fairly evident -- there are
traces very close to the mounting screw holes. Your metal washers
must have shorted them together, affecting wires to the memory.
I do mention to use nylon washers in the assembly notes:
"Flip the Handy Board on top of the battery pack, and use the self-tapping
screws to mount it in place. Do not tighten the screws so much as to dig
the screw heads into the printed circuit wires that pass underneath them.
If nylon washers are available, mount them between the board top surface
and the screw heads."
I will add a sentence telling not to use metal washers.
-Fred
> I've discovered the problem. When I mounted the Handyboard, I used metal
> standoffs. When the board is mounted,
> it doesn't work. When it isn't, it does. The solution then I guess is to
> use nylon washers to isolate the Handyboard
> from the standoffs. Fred, is there a reason for the strange behavior using
> metal standoffs? If so, maybe that should
> be emphasized in the installation instructions as well as here on the
> mailing list.
>
> Thanks,
> James Lewis
>
> -----Original Message-----
> From: James Lewis
> Sent: Wednesday, July 09, 1997 9:16 AM
> To: handyboard@media.mit.edu
> Subject: Corrupted or Invalid Pcode?
>
> I have been using the Handyboard successfully for over 6 months. Recently
> I've decided to mount it on my robot base. After all the dust settled last
> night, I powered up the Handyboard. Since I put the batteries elsewhere on
> the robot, I put a keyed connector between the batteries and the Handyboard
> (for future expansion!). Since the battery was disconnected for some time,
> when I applied power I just got the dark row of blocks on the LCD. I
> figure, no big deal, I just lost the pcode. So I use hbdl to reload the
> pcode. All seems to go well. I reboot the Handyboard and the "Interactive
> C V 2.81..." banner appears on the LCD. I then try to start IC on the PC
> with the following problems.
>
> 1) IC stays at 'Synchronizing with board' until I reset the handyboard.
>
> 2) Then IC comes back with the following message.
> 'Pcode version 10.81 detected'
> 'Invalid pcode or pcode corrupt."
>
> I have tried various pcodes (downloaded directly from the Handyboard page
> v3.1 for the retail version as well as v2.81 freeware).
>
> All have the same results.
>
> My question is this. It seems as though one bit is sticking high (10d =
> 1010b, 02d = 0010b). But why would the LCD work then?
>
> Thanks for any suggestions.
>
> James Lewis
> jlewis@nomadics.com
>
>
|
|
Message is in Reply To:
 | | RE: Corrupted or Invalid Pcode?
|
| I've discovered the problem. When I mounted the Handyboard, I used metal standoffs. When the board is mounted, it doesn't work. When it isn't, it does. The solution then I guess is to use nylon washers to isolate the Handyboard from the standoffs. (...) (27 years ago, 11-Jul-97, to lugnet.robotics.handyboard)
|
2 Messages in This Thread:
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
