=> R0 = 9 (reason code)
<= R0 preserved
R1 = pointer to word aligned table of supported baud rates
R2 = number of entries in table
Note: Each entry in the table is in units of 0.5 bit/sec
The index into the table (starting at 1) can be used in OS_SerialOp 5 and 6 calls to set the corresponding baud rate.
As the hardware on a given machine may not support certain baud rate combinations the table may have 'holes' in it, represented by a zero word - this way the index into the table can still be used with OS_SerialOp 5.
See also: PRM 5a-224
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