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DSP Area
From SnesLab
The DSP Area is a region of the 5A22's address space.
Map Mode 20 (LoROM)
In Mode 20, the DSP Area is 4M in size. It is normally located from 0000h to 8000h in banks 60h - 6Fh. When the program ROM is less than 8M in size, the DSP Area is instead located from 8000h to FFFFh in banks 30h - 3Fh.
References
- page 2-21-3 of Book I of the official Super Nintendo development manual