Correct me if I'm wrong
, but it looks like the USA built ignition systems discussed here and the system from Norway all use the PIC chip for controlling spark timing.
There is another chip used for controlling spark ignition on the Czech Falkon ignition systems found on ZDZ engines. The technical data sheet that accompanies the Falkon ignition systems lists an Intel MCS 51 chip for controlling the spark timing. Here is the link:
http://www.intel.com/design/mcs51/index.htm
I'm not an EE, so I don't know the difference, but it looks like there is more than one way to skin the spark-timing cat.
Bruce