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Intercommunication Device
From SnesLab
The Intercommunication Device exists inside the Super Game Boy. Its register file is connected directly to the 62-pins for the Cartridge Slot.
It converts 2bpp grayscale images generated by the SGB CPU to SNES PPU format, which are then transferred to WRAM and then VRAM by DMA.
Reference
- page 138 of the Game Boy Programming Manual, version 1.1