Radio Shack TRS-80 Model II Reference Manual page 109

Library Commands
STATUS
Display System Status Information
This command tells you the first address of protected high-memory (non-user
memory), and list the on/off status of various
TRSDOS
functions are active.
Sample Use
You want to locate a
Z-80
program at the top of memory. Use
STATUS
to find this
address:
STATUS
145