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Seemed like the Z/Architecture was backward compatible with S/390 up until IBM z13 (launched 2015) according to wiki. "z13s introduce a new vector architecture
by djmips 5y ago
Seemed like the Z/Architecture was backward compatible with S/390 up until IBM z13 (launched 2015) according to wiki.
"z13s introduce a new vector architecture and are the last z Systems servers to support running an operating system in ESA/390 architecture mode"
- wtallis 5y agoThe operating system now needs to natively support the 64-bit z/Architecture, but application compatibility still goes all the way back to System/360.
- p_l 5y agoHuge chunk of the OS is still 24bit code, then 31bit, little 64bit. The removal of backwards compatibility meant you couldn't setup LPAR or VM with 31bit OS anymore