RSTS/E version numbers

Antonio Carlini a.carlini at
Mon May 31 07:06:36 CDT 2021

Can someone explain RSTS/E version numbers to me?

They seem to be all over the place: V2A-19, V4A-12, V4B-17, V5A-21, 
V5B-24, V5C-01, V6A-02, V6B-02, V6C-03.

Then it seems to have switched scheme but the "-number" suffix 
reappears: V7.0, V7.2, V8.0-06.

Any clarification would be helpful.



Antonio Carlini
antonio at

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