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Lynn H. Maxson wrote:  
>   
> IBM itself internally took [PL/I] to 2, 3, 4, 5, 6,  
> 7, and 8, eventually to an internally used language,  
> PL/S, for their S/360/370/390 operating systems.  
 
Lynn,  
 
I've used PL/I since 1967 but never knew about these other versions.  
 
Do you know how PL/2..8,S were different from PL/I?  
 
- Peter  
 
 
 
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