When you run a non-
Language Environment-conforming routine in
Language Environment, you must
observe the following conventions:
- R13 must contain the address of the executing routine's own register
save area
- The register save area back chain must be set to a valid 31-bit
address (if the address is a 24 bit address, the first byte of the
address must be hex zeros)
- The first two bytes of the register save area must be hex zeros