(mirror of krom's post, originally found here)

max_power wrote:

In particular, this seems very useful and to be a part of a larger document which I have however not been able to find online.

Looking in that same directory at all the PDF files, I found this doc which seems to be part of the same set: http://hcs64.com/files/RDP_COMMANDS.pdf
I too would love to see the full set of docs, good luck with your search =D

Here is another useful unofficial doc from Dragon Minded: http://www.dragonminded.com/n64dev/Reality%20Coprocessor.pdf

BTW I have noticed a mistake in every single official/unofficial N64 doc I have ever come across:
The RDP opcode "Sync Load" is always stated as hex command "0x31" but the command portion is actually meant to be "0x26"!!

For completeness here is a list of every Nintendo patent I have found in relation to the N64 (This includes doubles):
http://www.google.com/patents/US5664162.pdf - GFX Acceleration Info
http://www.google.com/patents/US5742277.pdf - Antialiasing Of Silhouette Edges
http://www.google.com/patents/US5754660.pdf - 3D Sound Generation
http://www.google.com/patents/US5796547.pdf - Nintendo DD Disk Cartridge & Drive Mechanism
http://www.google.com/patents/US5812147.pdf - RSP Info
http://www.google.com/patents/US5897437.pdf - Controller Pak
http://www.google.com/patents/US5923641.pdf - Nintendo DD Disk Cartridge
http://www.google.com/patents/US5940245.pdf - Nintendo DD Door Opening & Closing Mechanism
http://www.google.com/patents/US5978339.pdf - Nintendo DD Mechanism Mount
http://www.google.com/patents/US6001015.pdf - Controller
http://www.google.com/patents/US6018720.pdf - Nintendo DD Purchase Software
http://www.google.com/patents/US6022274.pdf - RCP Info
http://www.google.com/patents/US6071191.pdf - RCP Info
http://www.google.com/patents/US6104402.pdf - Z-Buffer
http://www.google.com/patents/US6126547.pdf - 2 Player Viewport
http://www.google.com/patents/US6141730.pdf - Nintendo DD
http://www.google.com/patents/US6154338.pdf - Nintendo DD Cartridge Mechanism
http://www.google.com/patents/US6155926.pdf - Mario 64 Programming
http://www.google.com/patents/US6165073.pdf - Camera Look At Object
http://www.google.com/patents/US6166748.pdf - RDP Info
http://www.google.com/patents/US6190257.pdf - CIC & PIF Info
http://www.google.com/patents/US6200253.pdf - Controller Pak
http://www.google.com/patents/US6203431.pdf - Shadows
http://www.google.com/patents/US6220962.pdf - Direction Marker
http://www.google.com/patents/US6230232.pdf - Nintendo DD
http://www.google.com/patents/US6238291.pdf - Controller Bi-Directional Communication
http://www.google.com/patents/US6239806.pdf - Controller Analog Placement
http://www.google.com/patents/US6239810.pdf - RDP Info
http://www.google.com/patents/US6261179.pdf - StarFox 64 Programming B
http://www.google.com/patents/US6264558.pdf - Controller
http://www.google.com/patents/US6280329.pdf - Player State Music
http://www.google.com/patents/US6285381.pdf - Nintendo DD Video Capture
http://www.google.com/patents/US6290604.pdf - Shadows
http://www.google.com/patents/US6296570.pdf - StarFox 64 Programming A
http://www.google.com/patents/US6325717.pdf - Player Surface Interaction C
http://www.google.com/patents/US6331146.pdf - Mario 64 Programming
http://www.google.com/patents/US6331856.pdf - RDP Info + Usage Notes
http://www.google.com/patents/US6332840.pdf - Controller Analog Mechanism
http://www.google.com/patents/US6342892.pdf - RDP Info
http://www.google.com/patents/US6352476.pdf - Direction Marker
http://www.google.com/patents/US6383079.pdf - RCP Info
http://www.google.com/patents/US6383080.pdf - Kiosk Printing
http://www.google.com/patents/US6414678.pdf - Z-Buffer
http://www.google.com/patents/US6414721.pdf - Video Signal
http://www.google.com/patents/US6453379.pdf - Nintendo DD
http://www.google.com/patents/US6454652.pdf - Controller Enhanced 3D Character & Background
http://www.google.com/patents/US6464585.pdf - Controller + Sound
http://www.google.com/patents/US6468160.pdf - Nintendo DD Security
http://www.google.com/patents/US6485369.pdf - Player State Music
http://www.google.com/patents/US6497618.pdf - Controller
http://www.google.com/patents/US6538666.pdf - Speech Recognition
http://www.google.com/patents/US6540612.pdf - StarFox 64 Programming B
http://www.google.com/patents/US6556197.pdf - RDP Info + Usage Notes
http://www.google.com/patents/US6572478.pdf - StarFox 64 Programming A
http://www.google.com/patents/US6593929.pdf - RDP Info + Usage Notes
http://www.google.com/patents/US6612930.pdf - Player Surface Interaction C
http://www.google.com/patents/US6626760.pdf - Camera Look At Object
http://www.google.com/patents/US6634947.pdf - StarFox 64 Programming B
http://www.google.com/patents/US6676520.pdf - Controller Rumble Pak
http://www.google.com/patents/US6677967.pdf - Nintendo DD Video Capture
http://www.google.com/patents/US6679776.pdf - Vibration
http://www.google.com/patents/US6692357.pdf - Player Surface Interaction A
http://www.google.com/patents/US6712703.pdf - Player Surface Interaction B
http://www.google.com/patents/US6712704.pdf - Nintendo DD Security
http://www.google.com/patents/US6769989.pdf - Nintendo DD Randnet
http://www.google.com/patents/US6894686.pdf - Perfect Dark Perfect Head
http://www.google.com/patents/US6917356.pdf - Controller Analog Placement
http://www.google.com/patents/US6935954.pdf - Zelda Sanity System
http://www.google.com/patents/US6942573.pdf - Nintendo DD Security
http://www.google.com/patents/US7070507.pdf - Controller Rumble Pak
http://www.google.com/patents/US7102618.pdf - Controller Analog Placement
http://www.google.com/patents/US7302627.pdf - RSP Info
http://www.google.com/patents/US7466433.pdf - 3D Object Printing Service
http://www.google.com/patents/US7594854.pdf - Controller
http://www.google.com/patents/US7783535.pdf - Player Surface Interaction B
http://www.google.com/patents/US7873812.pdf - RSP Matrix Multiplication
http://www.google.com/patents/US20010001767.pdf - Shadows
http://www.google.com/patents/US20010006391.pdf - Nintendo DD Video Capture
http://www.google.com/patents/US20010010067.pdf - Nintendo DD
http://www.google.com/patents/US20010011036.pdf - Direction Marker
http://www.google.com/patents/US20010012802.pdf - Controller Rumble Pak
http://www.google.com/patents/US20010016517.pdf - Controller Rumble Pak
http://www.google.com/patents/US20010016518.pdf - Controller Rumble Pak
http://www.google.com/patents/US20010021670.pdf - GB Save Data Pak
http://www.google.com/patents/US20010046895.pdf - Player State Music
http://www.google.com/patents/US20020019257.pdf - Player Surface Interaction A
http://www.google.com/patents/US20020128070.pdf - StarFox 64 Programming A
http://www.google.com/patents/US20020155889.pdf - Player Surface Interaction B
http://www.google.com/patents/US20030080963.pdf - RDP Info + Usage Notes
http://www.google.com/patents/US20030087698.pdf - Controller
http://www.google.com/patents/US20030104864.pdf - Player Surface Interaction C
http://www.google.com/patents/US20040224760.pdf - Player Surface Interaction B
http://www.google.com/patents/US20050174328.pdf - Controller Analog Placement
http://www.google.com/patents/US20110072238.pdf - RSP Info
http://www.google.com/patents/USD376826.pdf - Prototype Controller
http://www.google.com/patents/USD377488.pdf - Cartridge
http://www.google.com/patents/USD381628.pdf - Connector Plug
http://www.google.com/patents/USD393013.pdf - Nintendo DD Unit
http://www.google.com/patents/USD402328.pdf - Nintendo DD Unit
http://www.google.com/patents/USD405477.pdf - Controller Pak
http://www.google.com/patents/USD410403.pdf - Voice Recognition Adapter
http://www.google.com/patents/USD419199.pdf - Nintendo DD & Console Stack
http://www.google.com/patents/USD419200.pdf - Nintendo DD & Console Stack
http://www.google.com/patents/USD428893.pdf - Cartridge
http://www.google.com/patents/USD442998.pdf - Nintendo DD Unit

I am also on the lookout for info on this N64 "Bézier surface" microcode: http://www.gamasutra.com/view/feature/131794/an_indepth_look_at_bicubic_bezier_.php?print=1

Hope this helps =D

*EDIT* I have updated this list with many more N64 specific patents. Special thanks to Gilgamesh for bringing them to my attention =D

Tibet Mimar Patents:
(Even though these are not N64 specific, you can see the formatting of RSP type vector opcodes in these patents)
http://www.google.com/patents/US6963341.pdf
http://www.google.com/patents/US7126991.pdf
http://www.google.com/patents/US7506135.pdf
http://www.google.com/patents/US7548586.pdf
http://www.google.com/patents/US7793084.pdf
http://www.google.com/patents/US7873812.pdf
http://www.google.com/patents/US8069334.pdf
http://www.google.com/patents/US8352528.pdf
http://www.google.com/patents/US20080077769.pdf
http://www.google.com/patents/US20090276606.pdf
http://www.google.com/patents/US20090316798.pdf
http://www.google.com/patents/US20100274988.pdf
http://www.google.com/patents/US20110072065.pdf
http://www.google.com/patents/US20110072236.pdf
http://www.google.com/patents/US20110087859.pdf
http://www.google.com/patents/US20130212353.pdf
http://www.google.com/patents/US20130212354.pdf
http://www.google.com/patents/US20130212355.pdf