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

Converts absolute track address (CCCCcccH) to a relative track number. Calculates the relative track number on the volume and stores the result in the first register. The second register is used as a work register.