A few Brainmaster show up every once in a while for a fair price on Ebay. Bought mine 20 years ago there. As the model number of the Brainmaster goes up so does it capabilities. The 3250 is the one to have,
Been a few years since I used it on a friend's 84 SS but could never part with the 3250 and the nice plastic case. I would plug it in, drive the car, good info. Just a PITA trying to drive and toggle two rotary switches to change input data, with a stick shift. Other than that the 3250 is a good friend for a CCC system to have.
One of the things noticeable when streaming data from a CCC's dinosaur ECM is how slow it is. Oh how we have progressed.