In first plane, pointed by Leonard's thumb, the 2MB EPROM. At the left, 512MB RAM. Just right to Leonard's thumb, the YMF278B-F chip, known as OPL4. This chip, produced by Yamaha, is capable of 18 FM stereo sound channels and 24 wavetable PCM stereo sound channels. Just above it, the DAC (digital-analog converter). In the right side, a flat cable, which connects the entire board to a special buffering cartridge, which protects the MSX slot in case of a short-circuit in the main board.