Normalize cylinder number (TRKADDR NORMALIZE)

The format of the execute form of the TRKADDR NORMALIZE macro is:


>>-+-------+--TRKADDR--NORMALIZE--+-,cchh--+--,REG=(rega)------><
   '-label-'                      '-,(reg)-'

Reverses the 16-bit and 12-bit portions of the cylinder number and stores the result in the 32-bit register with the H digit so you can use a simple unsigned comparison. The CCCCcccH becomes cccCCCCH. Use this when comparing one cchh against another. Normalize each and do an unsigned comparison.