16Mbytes of DRAM
The console's main memory consists of a single 16Mbyte DRAM chip. This is a PC-133 DRAM chip as found on computer DIMMs. In fact, it was snagged off of a 128Mbyte DIMM module I had laying around! This DRAM is connected up to the FPGA and runs on 3.3V. For the NES configuration, the FPGA dual ports the DRAM and automatically refreshes it, all behind the scenes.