The filming of Scrubs takes place in Los Angeles, California in the North Hollywood Medical Center (a non-operational hospital). The fictional place that Sacred Heart is located in Scrubs is known as San DiFrangeles. Which happens to be a mixture of the name San Diego, San Francisco, and Los Angeles.
JTAG is an IEEE standard (1149.1) developed in the 1980s to solve electronic boards manufacturing issues. Nowadays it finds more use as programming, debug and probing port. But first, let's see JTAG's original use, boundary testing. Boundary testing
Now, the JTAG controller can also be used for hardware testing, which is called the JTAG Boundary scan and is another IEEE standard. This Standard is entitled JTAG IEEE Standard 1149.1 which is the initial reason the JTAG controller was developed. These are probably the two most popular JTAG Standards used today.