[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

>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://minnie.tuhs.org/pipermail/tuhs/attachments/20181231/47487642/attachment.html>


More information about the TUHS mailing list