What is the lowest DEC/Compaq/HP(E) version it is possible to upgrade
Well, just read the documentation. Both the VSI OpenVMS Alpha Version
8.4-2L1 SPD and the VSI OpenVMS Alpha Version 8.4-2L1 Upgrade Manual
• HPE Version v8.4 U900, U1000, U1100, U1200
• HPE Version v8.3
• HPE Version v7.3-2
These manuals also give you a (short) list of *supported* AlphaServer
models (all EV6+, DS10 to ES47), but we have learned from VSI
presentations and webinars as well as from postings in this group that
these are the models which were used for testing by VSI. As no features
were removed from HPE VMS when moving on to the VSI build, your chances
are high that the software will run on older models supported by HPE
OpenVMS as well. Just don't request a fix from VSI if a problem shows up.
I personally have/had VSI OpenVMS running on emulated AlphaServers 800
and 4100, among others. This with CHARON-AXP, which emulates the various
hardware models very closely.