Just as spaces can be divided into subspaces, subspaces can
be further divided by using location counters. You can use up to
four location counters in each subspace, and the Assembler fills
a separate area for each location counter. When the assembly is
complete, the subspace is formed by concatenating each of these
areas. All references relative to a location counter are relocated
so that they are relative to the complete subspace.
Unlike subspaces, however, the use of location counters is
completely local to the Assembler. Once the subspace is formed at
the end of the assembly, the distinction among the individual areas
built by location counters disappears. No further reordering or
grouping related to location counters is performed by the linker.
This facility allows you to assemble related data into disjoint
pieces of a subspace, while keeping the source code in a convenient
order.
The .LOCCT
directive is used to switch from one location counter to another.
The Assembler automatically remembers the previous value of each
location counter within each subspace. When the .SUBSPA
directive is used to switch subspaces, the Assembler automatically
begins using the location counter that was last in effect in the
new subspace.
