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[wxsig] Programming/Communicaton Problems

John Koster w9ddd at tapr.org
Tue Mar 21 06:17:37 UTC 2006

Are you trying to do software development, or just load the lastest 
revision of the T238 software?  

Also did you download the correct assembly manual?  Otherwise I don't 
understand the comment about the board not being identical?

John, W9DDD

On Tue, 21 Mar 2006, David wrote:

> Dear all,
> I decided to have a go at making the T238+.  For the most part, I have
> constructed the board using the same component layout as indicated in the
> manual.  Obviously the board is not identical, and the PCB has more jumpers
> on it than I would have liked, but then with my limited resources, it's
> hardly surprising.
> However, my problems are with trying to program the MCU.  I have downloaded
> the P&E toolset from Motorola, but I'm still unable to communicate with the
> circuit.  I have completed the modifications to my board, as described on
> page 12 of the "T-238+ Operations Manual", which allows me to use the DE-9
> connector as a debug port by jumpering some of the pins on the debug header.
> I have further read that the original T238 circuit required a
> 9.8304MHzoscillator to make use of the debug port, and the datasheet
> for the
> MC68HC908GP32 chip seems to confirm this.  Therefore, I can only assume that
> I need to build an additional circuit to accommodate this feature.  Am I
> correct in this assumption?  If so, does anyone have any recommendation as
> to how and where I connect the circuit?
> I'm sure that I've overlooked something, but since my background is not
> really in electronics, I'm trying to pick this up as I go along.  This I why
> I started the project in the first place:  to expand my knowledge in
> electronics and radio communications.
> I thank you in advance for any assistance you can provide me.
> 73,
> David - VA7DMS
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