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DSP Interface Register

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The DSP Interface Register allows for the S-SMP to communicate with the S-DSP. It is 16 bits wide, consisting of two 8-bit subregisters:

00F2h holds the target DSPRAM address
00F3h holds the data byte 00F2h points to

Its value is indeterminate upon reset.

Reference

page 3-6-1 of Book I of the official Super Nintendo development manual

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