MVS 3.8 was the last true free sourced included version of
MVS and remains the base of z/OS to this day. Volker
Bandke made it widely accessible combined a well packaged system
with a turnkey distribution of the Hercules mainframe
You can download the more up to date MVS 3.8j Tur(n)key 4- System
by Jurgen Winkelmann here
As an MVS 3.8 hobbyist you might be interested in this recently unearthed tape of ASP 3.2
The tape is AWSTAPE format (You will need Hercules, P390, etc to read or use file 533 VTT2TAPE utility to convert it to a real tape).
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