=> R0 = offset (0 - &FFF) from podule's address space base.
R1 = number of bytes
R2 = pointer to buffer
R3 = expansion card number
This SWI writes bytes directly to an expansion card's address space, typically to write hardware registers. Use Podule_WriteBytes to write to an expansion card's code space.
Do not try to write to an extension ROM - this will probably result in the memory or video controllers being reprogrammed.
See PRM 4, page 148.
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