This is part of the table builder; it scans all banks of a given memory region (division usually) to identify the wanted/unwanted banks. It is called for garbage collection, but also for output.
case 1 : bank chaining clobbered
The following numbers are given in /QUEST/
for case 1 : IQUEST(11) = LN, the start of the clobbered region IQUEST(12) = LIM1, the start of IQUEST(13) = LIM2, the end of the region to be scanned
See MZFLAG