Wiring to Xbox The Matrix Programmer is an older device that was developed for use around 2011 (that's why it is cheap).
Here is the tricks that I have figured out to get it working.
A bit too long.) It is now not that straight forward to use it (otherwise where is the fun of it). (I could go cheaper to build a parallel port adaptor, but that is 30 minutes for each NAND reading. On eBay, I found the for around $8 shipped. As I always are, I am trying to find the solution to the problem at the lowest cost. There are also v1 version, and also an older programmer called NAND-X. The most common ones at this time is J-R Programmer v2 by (at on Internet, plus shipping).
Apparent somebody has figured out the JTAG signals on the Xbox 360 board, and there are plenty of JTAG/NAND programmers out there. In order to mod the Xbox 360, the first step is being able to read/write the NAND on Xbox 360.