N2100 JTAG Access

From Thecus Wiki

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

References

Wikipedia - Joint Test Action Group Definition
Intel 80219 General Purpose PCI Processor Datasheet - Figure 5. Ball Map - Right Side - Top View