Return codes from the USRn formatter
When your USRn formatting routine returns control to the system,
it must put a return code into register 15, based on whether or not
it formatted the TTE. The possible codes and their meanings are:
- Code
- Meaning
- 0
- The USRn TTE was formatted
- 4
- The USRn TTE was not formatted
The user should restore registers 0 through 13.