Hardware Documentation - Chips - MIPS
Here are some links to information about the MIPS processor, as used in Digital DECStation, ARC, Cobalt, and SGI machines.
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Instruction sets, processor user manuals, and assembly language programmer's guides.
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MIPS Processor ABI Conformance Guides, version 1.1 and 1.2.
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It includes a full description of the MIPS architecture from the perspective of the assembly and C language, with special emphasis on issues related to embedded applications. Only the preface and a couple of examples are online. Appears to cover the R3000
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MIPS software simulator (SPIM)
Instruction level simulator including X Window System's interface.
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It includes the RM7000 and RM52xx (R5000 compatible) information.
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R4x00 Interface Design Guide [PostScript file]
Design-oriented documentation regarding the system interface of the MIPS 64-bit R4x00 processors.
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It includes some MIPS manuals.