Here is an excerpt from an interview with Jim Blanchard of (then) ASM, which was posted on the other (blue) site:
"[ASM does] what's called high-pressure, high-temperature molding process. We're using 150-ton presses, and we're using 250+ degrees of temperature. So, the combination of the two gives a very, very sharp detail to our chips. As compared to the common company we get compared to, Paulson. Paulson does just the opposite. They use a low-pressure, low-temperature process."
There is some other interesting information in that post, including a discussion of colors, edgespots and molds.