Knowledge Base

It’s possible to query the CPU device for a unique ID.  These come in either a 16-bit version:

   SPxPoll2     6,!CPU

…or a 24-bit version:

   SPxPoll4     2,!CPU

The 16-bit version returns the unique ID in U[0] and U[1], while the 24-bit version returns it in U[0] to U[2].