[Info-vax] HP wins Oracle Itanium case

Bob Koehler koehler at eisner.nospam.encompasserve.org
Wed Aug 22 09:05:28 EDT 2012


In article <h5SdnYbK0tgobq7NnZ2dnUVZ_t6dnZ2d at giganews.com>, "Richard B. Gilbert" <rgilbert88 at comcast.net> writes:
> 
> The VAX Architecture ported successfully to Alpha.

   The VAX Architecture was nothing like the Alpha Architecture, except
   for a few features.

   similarities:
   1)  VAX and Alpha have flat address spaces
   2)  VAX and Alpha include features that make running VMS a little
       easier
   3)  VAX and Alpha do VAX F and G floating point
   4)  VAX does, and Alpha can, run in little endian mode
   5)  VAX does, and Alpha can, support 4 security access modes
   6)  they both came from DEC

   major differences:
   A)  VAX is 32 bit, Alpha is 64 bit
   B)  VAX is CISC, Alpha is RISC
   C)  VAX does lots of memory to memory operations, Alpha is primarily 
      LOAD/STORE
   D)  VAX has lots of addressing modes, Alpha has 16 bit offsets from
      a base register, and a couple of others
   E)  VAX does VAX D and H floating point, Alpha does IEEE S and T
      floating point





More information about the Info-vax mailing list