Yes, as far as I know the two registers 0x5c and 0x5b are undocumented, but they're used in the stream_transfer_write function to write chunk by chunk and in a bunch of other functions to read and write feature settings. I find it more convenient to use these rather than read the entire content of 0x5e to modify only a few bits. I came to wonder why they decided to privilege the latter option.
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