Posted By
crock
on 2011-10-22
12:21:50
 |  Re: Pre production Plus4 board manufacturing fault
Well, it did actually  , although the fault may have been there already. One of the drams had a column stuck high. Fortunately is was easy to trace and replace the culprit. It's 100% again now.
My diagnostic setup has loopback dongles on all the external ports. The user port specifically has checks for the 8 general i/o ports and on the RS232 RTS/CTS Rx/Tx, DCD/DSR.
See the movie here:
http://www.youtube.com/watch?v=BCw3PD5cb88
Rob
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