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Originally Posted by design256
The only interesting pin was 15. This is nominally high (3.5v), but emits a start bit followed series of 16 data bits at approximately 9600 baud whenever a key is pressed or released. As far as I can tell, no other data (like a console) is present on this pin.
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Well, it could be some sort of custom debug, some JTAG, or some real console with output debug at every keypress. One could try to attach a term to pins 14 and 15, but what about the flow control?
On other hand, there is still the internal connector if they want to have a serious debug.