MIPS I-IV instruction set standards
Maciej W. Rozycki
macro at linux-mips.org
Tue Mar 7 17:42:42 CST 2017
On Tue, 28 Feb 2017, Angelo Papenhoff via cctech wrote:
> I'm wondering where the MIPS I-IV standards that are referenced
> everywhere are defined. I was able to actually find what seems to be the
> IV standard  but found no such thing for I-III. I didn't even find
> any bibliographic references to them. Did they only exist as printed
> books and nobody bothered to scan them? Or are they under copyright?
> Would be nice to have them accessible somewhere.
A differently formatted copy of the same document used to be available at
though `techpubs.sgi.com' has been recently taken offline I'm told (and I
haven't checked if `archive.org' has a copy). In either version of the
document you can see how the ISA has progressed in the opcode tables
towards the end of each appendix; this might be the best original ISA
reference readily available.
As to the earlier ISA levels I believe their definitions were only buried
as parts of the respective MIPSCO processor manuals, i.e. the R2000/R3000,
the R6000 and the R4000/R4400.
The latter is available online in several places; originally at
The final version of the R6000 manual may not have been made. A very
early revision was found and has been scanned and published at
<ftp://ftp.linux-mips.org/pub/mips/docs/r6000/> as tarballs of TIFF images
(I have made a PDF conversion and placed the result at
<ftp://ftp.linux-mips.org/pub/linux/mips/people/macro/MIPS/>). It is
inaccurate and lacks opcode encodings.
I have seen a copy of the original R2000 manual once, in the form of a
collection of pages in a ring binder. That copy may have been lost since.
Silicon manufacturers like IDT, LSI Logic, Performance Semiconductor or
Siemens published their R2000/R3000 (and R2010/R3010 FPA) implementation
manuals though that may serve as a reference; you should be able to track
down scanned copies online.
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