Mark Morgan Lloyd wrote:
Quite frankly, from what I've seen most Windows users would find Linux
simpler than one of the *freely* *available* IBM OSes (i.e. MVS, VM/360
"sixpack" and so on).
To avoid ambiguity: that was a typo, and I meant "VM/370 'sixpack'".
As background: it appears that IBM didn't embed copyright notices in the
source or binary of their early operating systems, with the result that
older versions of the DOS, OS, and VM lines are now described as being
in the public domain. There's a hobbyist community that runs these under
the Hercules emulator, IBM is aware of this but generally keeps its
distance.
All of these date back to the era when addresses (certainly per-process,
and usually system-wide) were 24 bit, i.e. there was a process or system
restriction of 16Mbyte of "core". Unfortunately, GCC can't compile
itself in 16Mb, so somebody's created a patch for the Hercules emulator
and for the operating systems which allows one program at a time to
allocate storage from "above the line", this is referred to as the /380
hack http://mvs380.sourceforge.net/ and hardly anybody's happy about it.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
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