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 

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