jmarek@td2cad.intel.com (John Marek) (07/24/89)
Question: Are the MIPS R2000 and R3000 chips fully instruction-set
compatible? If not, is the R2000 fully upward compatible to the R3000, and
what R3000 instructions are not downward compatible.
What is MIPS's commitment to instruction-set compatibility in future versions
of the R-series chips?
Thanks.
John.
--
John Marek jmarek@td2cad.intel.com
"Where does he get those wonderful toys?"
Any opinions in the above text are my own but feel welcome to use them.rogerk@mips.COM (Roger B.A. Klorese) (07/25/89)
In article <2171@td2cad.intel.com> jmarek@td2cad.intel.com (John Marek) writes: > >Question: Are the MIPS R2000 and R3000 chips fully instruction-set >compatible? If not, is the R2000 fully upward compatible to the R3000, and >what R3000 instructions are not downward compatible. The R2000 and R3000 are 100% ISA-compatible. The only differences are in the areas of cache interface (direct drive supported) and functionality (refill line size, read-modify-write on partial word stores), and are totally invisible to software. >What is MIPS's commitment to instruction-set compatibility in future versions >of the R-series chips? Future versions of the chips will fully support the ISA as currently documented for the R2000 and R3000. -- ROGER B.A. KLORESE MIPS Computer Systems, Inc. phone: +1 408 720-2939 928 E. Arques Ave. Sunnyvale, CA 94086 rogerk@mips.COM {ames,decwrl,pyramid}!mips!rogerk "I want to live where it's always Saturday." -- Guadalcanal Diary