11 Sep
2015
11 Sep
'15
7:49 a.m.
On Fri, Sep 11, 2015 at 8:39 AM, Johnny Billquist <bqt at update.uu.se> wrote:
On 2015-09-11 16:36, Noel Chiappa wrote:
WHile I agree that the PDP-11 is a wonderful architecture, it really is a
few bits short of perfect, both for addressing, and for opcode allocation.
The is obvious when you look at the EIS and FPP extensions, which could
not retain the general instruction layout format because of a lack of bits.
I loved the PDP-11 architecture, until I wanted to run programs on it that
relied on the overlay manager and the overlays got to be 8 or 9 deep. Then
it was... painful.
Warner
From: Jon
Elson elson
I actually LIKED the PDP-11 architecture quite a
LOT, but the
limited
memory was a big killer.
The good thing about the PDP-11 was the 16-bit word size. (It resulted in
what's probably the most elegant architecture, in bang/buck terms, of all
time.) The bad thing about the PDP-11 was the 16-bit word size. (For the
reason you point out.)