Uploaded October 2023 | Updated September 2026, 2 weeks ago

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NOTE: This Video was re-uploaded due to a re-edit.

I recently got a hold of one of these very rare Nintendo N64 Development cartridges know as the "IS-VIEWER 64". I decided to buckle down and actually get the unit up and running. Many collectors that own these cartridges, simply have them sitting on a shelf as a collectable Trophy.
That idea I just found to be disturbing!! *#&$&*@!

So, after over a month of intense research, and then some time in the Electronics Lab...building up a Custom SCSI-2 interface cable...and also after getting some help from the N64 Development community in tracking down a Windows Driver, I managed to get the unit up and running!!

The Nintendo "IS-VIEWER 64" is a RAM only based development cartridge released by the company "Intelligent Systems" in the late 90's for development on the Nintendo N64.

The main advantage of this development cartridge (at the time it was released) was the high speed data transfer rate which the on board SCSI interface provided. This allowed the shortest load time from a source code editing phase, to compiling and running the compiled ROM on the real hardware. Average load time varies based on the ROM game size...however averages may vary between 10-30 seconds. Again...all depending on the game ROM size.

Being a RAM based cartridge, this means that each time you power up the Cartridge, all Game data must be loaded into RAM through the SCSI interface. Once power is removed or the cart is disconnected, all loaded Game data is lost.

Next, the IS-VIEWER64 requires a specially Modded N64 Console for it to work properly. This is similar to the Kmc PARTNER-N64 Debugging console Mod.

UPDATE:
Also just to let you all know....both the PARTNER-N64PC CD and the Scanned User's Guide are now available for download: ....along with a Huge massive Archive of N64 Development CD's.

You can check it out over at: Ultra64.ca
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#n64 #sega #gamedev #retrogaming #megadrive #genesis #electronics #computerscience #fpga #videogames #developmentkit