Let’s look at the original purpose of JTAG, boundary testing

JTAG controls (or HiJack) all IC pins. On the picture, maybe the JTAG will make all the CPU pins output…
FPGA House published on 11-29 11:21•198 Reads
Main features and application advantages of 2200 series PROGRAMMABLE DC power supply
Whether in research LABS, design and development, or in production testing, the wide range of voltage outputs of the 2200 series PROGRAMMABLE DC power supply are suitable for testing…