[TUHS] Re: Porting Unix v6 to i386
bqt at update.uu.se
Fri Feb 1 04:51:41 AEST 2002
On Thu, 31 Jan 2002, P.A.Osborne wrote:
> On Wed, Jan 30, 2002 at 08:50:31PM +0100, Johnny Billquist wrote:
> > On Wednesday 30 January 2002 10:18, P.A.Osborne wrote:
> > > Having had a rummage and a chat with acolleague here at
> > > UKC - it seems that V6 will be easier than V7, partially because
> > > of the Lions commentary - but mainly because 286 protected mode
> > > gives a very similar handling on memory management as the PDP did.
> > What a silly argument.
> > V6 and V7 both run on the PDP-11, so the memory
> > management hardware used by them both are the same.
> Having looked through the source of v6 and v7 the comments are shall
> we say minimalistic to people who are not as familiar with the PDP
> architecture as say Ritchie and Thompson - ie ME! Hence the Lions
> commentary makes life a darn site easier.
> I am not disagreeing with the second point you have made. However the
> point is that V7 is a development on from V6 and the memory management
> is more complex and thus requires more work.
I thought I only made one point, and that was that the argument for V6
being easier to port because "286 protected mode gives a very similar
handling on memory management as the PDP did".
Since V6 and V7 both run on the PDP-11 it can absolutely not be an
argument for preferring V6 to V7.
Thus I think it is a silly argument.
The rest is purely speculative on my behalf, and I really don't want to
debate wether V6 or V7 would be better to port.
I have a proper PDP-11 at home, and in addition, I run RSX, not Unix on
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at update.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
More information about the TUHS