Developed by Capcom Production Studio 3, the concept of a prequel to the original Resident Evil first blossomed shortly after the Nintendo 64's announcement in 1995, when the original game itself was still in development. Resident Evil Zero was originally intended to be sold on a CD on the Nintendo 64DD peripheral, with the possibility of an N64 cartridge-based version also being considered in 1997. The Nintendo 64DD was of great interest at the time due to the discs' ability to hold 64MB of data; early Nintendo 64 cartridges only contained 4MB of data, with 32MB games being more popular later in its life (Resident Evil 2 was one of only three Nintendo 64 games to even require a 64MB cartridge). Possibly as a result of the 64DD's delays, Production Studio 3 later chose to shift development