The attached hello.c is a simple hello world program. Build it ...

% cl2000 hello.c -z -o hello.out -m hello.map
<Linking>

Then inspect the map file. In the MEMORY CONFIGURATION table, this shows ...

  DATA                  00000000   00010000  00000ad0  0000f530  RW  

The fourth column is how much of the memory range is used, which is 0xad0 words in this case.

However, looking at the highest section allocated to DATA, this shows ...

.cio       1    000009c0    00000120     UNINITIALIZED
                  000009c0    00000120     rts2800_ml.lib : trgmsg.c.obj (.cio)

Note that 0x9c0+0x120 = 0xae0, and not 0xad0.