I have located the two pins on the large 50 pin connector that joins the two boards in the
ICC which are UART#5.. It's the spare serial port on the non-sat-nav units. I've even written a program that confirms it works with proper output (on both the S5-Tx line and the S1-Tx line - which is the debug terminal).
This image always had my interest though. And today, I had to "repair" the Terry unit again! The hmi executable had a new corruption (actually there's about 15 files that no longer match the snapshot I had taken after fixing the unit a month ago).
No wonder, some "smart-
ar people" are keeping repaired units in temperature controlled environments before moving them on.
My computer room got to 34C today - between boots where it was working to when it failed (yep, I had caught it between boots - and there were lots of reported ECC errors, more than usual).
(Tx line from the main CPU marked - 34 [tx] & 36 [rx].)