[fpc-devel] Re: fpc-devel Digest, Vol 112, Issue 32

Steve Smith fski12 at yahoo.com
Sat Aug 24 06:12:40 CEST 2013

On 23/08/13 21:50, Mark Morgan Lloyd wrote:
> 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.
What relevance does GCC have? The fact that there is an environment in which 
it may not work isn't regarded, by me at least, as unfortunate.

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