Prototype thread:

Battlefield DOMINATION - Map Strategy. One of the demos included on the #Nintendo64 ‘Secret Screen’ prototype. The only functionality in this demo is a moveable arrow, controlled by the D-pad...
The proto is a one off and appeared in the Sept ‘97 EGM below an article about the Dreamcast (later leading the inventor to claim the DC VMU was a copycat design). But what’s going on inside this N64 controller add-on unit? Let’s crack it open and find out...
Inside the main body is ... a modified #GameBoy 😯 with ROM board soldered via wire ribbon cable. The N64 controller is also heavily modified.

Nintendo rejected the concept but would themselves pursue handheld interfacing to consoles more seriously from #GameCube + GBA onward
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