[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