Sega would need to stick to Saturnday, keep the system as a 2D system with 3D capabilities, focus on Europe (especially Eastern Europe) and Asia, Sega appeals the teen crowd and uses the Segata Sanshiro ads in the US and Europe,and develop a Sonic title (not 3D Blast or Xtreme but maybe a Metroidvania style game with a similar plot to Adventure 1 with the ability to play as multiple characters with different play styles)
Nintendo would have to adapt CDs (maybe use the proposed Caddy CD design that would have been used on the Play Station), keep Squaresoft and DMA Design in the Nintendo fold (even if it means Nintendo acquiring DMA), release Mother 3 and Fire Emblem 64 on the system at some point, don't waste time or money on the Virtual Boy, finally design a good controller.
Now the following should happen to Sony: Superman 64 is developed for PS1 and not N64, Spyro and Crash are developed for N64 and PC, Konami develops Metal Gear Solid for PC and Saturn only, The PS1 has a faulty disc drive, Sony insists on manufacturing the discs by themselves, Sony's management is very arrogant (ITTL) ,and finally the PS1 has very, very, bad loading times.
The impact becomes either a Sony that quits or teams up with Microsoft.
Nintendo would have to adapt CDs (maybe use the proposed Caddy CD design that would have been used on the Play Station), keep Squaresoft and DMA Design in the Nintendo fold (even if it means Nintendo acquiring DMA), release Mother 3 and Fire Emblem 64 on the system at some point, don't waste time or money on the Virtual Boy, finally design a good controller.
Now the following should happen to Sony: Superman 64 is developed for PS1 and not N64, Spyro and Crash are developed for N64 and PC, Konami develops Metal Gear Solid for PC and Saturn only, The PS1 has a faulty disc drive, Sony insists on manufacturing the discs by themselves, Sony's management is very arrogant (ITTL) ,and finally the PS1 has very, very, bad loading times.
The impact becomes either a Sony that quits or teams up with Microsoft.