[TUHS] Upgrading from 11/40 to 11/45 in Unix v6
Warner Losh
imp at bsdimp.com
Tue Jan 1 06:06:50 AEST 2019
On Mon, Dec 31, 2018, 1:38 PM Noel Chiappa <jnc at mercury.lcs.mit.edu wrote:
> > From: Paul Winalski
>
> > What is magic number 0411? That one I've never heard of before.
>
> It's a PDP-11-ism. Separate I+D.
>
Venix/86, a v7 sys iii hybrid that ran on 8086/286 also uses it for
basically the same thing... its compiler was limited to one 64k code
segment and one 64k data / stack segment. The syscall interface depends on
this quirk as well...
Warner
>
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