[Python-Dev] %b format? - 8088 like a PDP-11 I think not...

Greg Ewing greg@cosc.canterbury.ac.nz
Thu, 07 Jun 2001 14:22:33 +1200 (NZST)

Jack Jansen <jack@oratrix.nl>:

> with even SP and PC being general purpose registers

The PC is not a general purpose register in the 68000.
I've heard that this was because DEC had a patent on
the idea.

> the latter two actually improved on the PDP-11

The 16032 was certainly extremely orthogonal. I wrote an
assembler and a compiler for it once, and it was a joy
after coming from the Z80! It wasn't quite perfect, though -
its lack of a "top-of-stack-indirect" addressing mode was
responsible for the one wart in my otherwise-beautiful
code generation strategy.

Also, it must have been the most CISCy instruction set
the world has ever seen, with the possible exception of
the VAX...

Greg Ewing, Computer Science Dept, +--------------------------------------+
University of Canterbury,	   | A citizen of NewZealandCorp, a	  |
Christchurch, New Zealand	   | wholly-owned subsidiary of USA Inc.  |
greg@cosc.canterbury.ac.nz	   +--------------------------------------+