On Fri, Sep 11, 2015 at 8:39 AM, Johnny Billquist <b...@update.uu.se> wrote:
> On 2015-09-11 16:36, Noel Chiappa wrote: > >> > 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.) >> > > 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
