On Thu, 24 Jan 2019 06:17:47 -0600, John McKown wrote:

>This is mainly a curiosity question. I know of: z/OS, z/VSE, z/TPF, and
>z/Linux. Are there any others?

None of these were ever enhanced to support zArchitecture, though they might be 
able to run on older z hardware, that could still IPL in OS/390 mode.

MTS, the Michigan Terminal System
UTS, Amdahl's implementation of Unix for 370 & 390
TSS

-- 
Tom Marchant

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