Tony, >> 14) And to make it even more challenging, the code *must* run in a older >> processor that does not support branch-retaliative nor BAKR/PR >> instructions.
Where would someone find such a processor? Facts are: 1.) BAKR/PR are around for very long time. 2.) The stack needs an infrastructure which has been made available by MVS and by VSE for a very long time. How about a rephrase of no 14 to: BAKR / PR can not be used because of private multitasking. -- Martin