The Extension Port
is what Nintendo
names the ports placed on their consoles allowing for connectivity to either other systems, or peripherals that were released after the fact.
EXT named ports can be found on many Nintendo consoles, such as the Game Boy
, the Super Nintendo
, the Virtual Boy
, the Nintendo 64
, and even the GameCube
The EXTension port on the Nintendo 64 game console
, is found on its bottom side. It reads "EXT." and stands for extension. It is a cartridge drive but with a slightly different interface than the one above on the main deck. It has the same number of pins as the main cartridge slot and the same data transfer speed. The special Pokémon Nintendo 64 lacked this extension port, probably because at that point Nintendo knew there was no use for it. While the most popular of uses was the 64DD
, other companies found uses for the Extension port, primarily for piracy
, though the hardware was originally intended for, and used by some companies, as an inexpensive N64 development device, or even just to quickly develop a product demo.
When not in use, it is covered by a plastic cap, which one has to remove before installing the 64DD under it.
Main article: Nintendo 64DD
The 64DD is a unit that was used for expanding games for the N64 unit.
 Doctor V64
Main article: Doctor V64
The Doctor V64 is a unit that attaches to the bottom of the N64, that loads Nintendo 64 ROMs
via an attached CD-ROM
Main article: CD64 (Nintendo)
The CD64 also attaches to the bottom of the N64 and runs ROM files via a CD-ROM. It had the ability to manage games a save files via PC
connectivity (parallel port). The CD64 also had the added feature of having a GameShark
-like program that could be used to cheat.
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