If you search GitHub or Chinese hardware forums (like 52arm.com or amobbs.com), you will find several reverse-engineered schematics. While Segger has never officially released the V9 schematic (it is a proprietary trade secret), hobbyists have traced the PCBs.

Small 22-33 ohm resistors are placed on signal lines (TMS, TCK, TDO, TDI) to reduce ringing and signal reflection.

For more information on the J-Link V9 and its schematic, check out the following resources:

If you are looking at a schematic for a or a DIY version, you will often find:

The V9 schematic remains popular because it is the last "cloneable" version.

"Come on, talk to me," Elias whispered, probing a test point near the microcontroller.

: The probe uses this to sense the target board's voltage and adjust its signal levels accordingly.