Nintendo 64 DD

The N64 DD is a Super-Rare Console Add on for the N64. It came bundled with a modem and a RandNetDD Disk. The released games include:

RandNet DD

Doshin The Giant

DTG Expansion Pak

F Zero X expansion Pak

Mario Artist (4X)

Japan Pro Golf Tour

Sim City 64

It plugged into the EXT Port on the N64