Added yesterday on
bitsavers: scans of
007-0601-010_IRIS-4D_Programmers_Guide_Volume_II_v1.0_1987.pdf
007-0605-010_IRIS-4D_Users_Guide_v1.0_1987.pdf
007-0701-010_C_Language_Reference_Manual_v1.0_1987.pdf
007-0730-010_Assembly_Language_Programmers_Guide_v1.0_1987.pdf
007-0905-010_IRIS-4D_Series_Compiler_Guide_v1.0_1987.pdf
007-0906-030_dbx_Reference_Manual_v3.0_1990.pdf
in the pdf/sgi/iris4d/ directory. I don't provide direct links, please use a mirror close to your location whenever possible.
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R4000
R4400
R4400
R8000
R10000
R4000PC
R4000SC
R5000SC
R5000
RM7000
2xR10000
R12000 
-
2x2xR10000
R16000 
among more than 150 machines : Apollo, Be, Data General, Digital, HP, IBM, MIPS
before SGI, Motorola, NeXT, SGI, Solbourne, Sun...