N2100 JTAG Access

Using the ball map from the 80219 datasheet I traced the relevant pins to the 8 bits of solder next to J1:



Relevant Processor Pins
The relevant processor pins are detailed in the processor datasheet and are clearly labelled on the board:

TDO - 21AC TRST# - 22AC (not used for our purposes) TCK - 22AD TDI - 21AE TMS - 22AF

JTAG Access
Just above J1 the relevant points on the board are labelled as R314, R315, R316, R317. You will need to supply VEE/VCC @ 3.3v from elsewhere. Here is what they do:

R314 - TDI R315 - TMS R316 - TCK R317 - TDO