Some articles on zaap, zaaps:

Z Application Assist Processor
... The IBM System z Application Assist Processor (zAAP), previously known as the zSeries Application Assist Processor, is a mainframe processor introduced by IBM in 2004 ... zAAP engines are dedicated to running specific Java and XML workloads under z/OS, accelerating performance ... zAAPs are available for zSeries 990 and 890 servers and all System z9 and System z10 servers ...