The earlier ME versions used an ARC. The later ones use a SPARC.
Look at slide 50.
Slide 50 just says "Questions?"
Slide 16 says that ME v1.x used an ARCTangent-A4 and that ME v2.x uses an ARC 600.
Take a look at the PDF version on recon.cx linked by jesrui— it's substantially different from the slideshare version in a few places, notably that it talks about a third generation (Bay Trail TXE) which uses SPARC and drops the pesky Huffman coder entirely in favor of LZMA.