> Both power and 68k macs use a 3.68 MHz receive clock (14400 * 256).
> So from the BRG, the highest baud rate is 14400*256/16/4 = 57600.

Only if you insist on using the BRG in divide-by-16 mode.  Use
divide-by-1 instead and your max rate is 14400*256/4 = 921600, just as
the SPARC's max rate in divide-by-1 mode is 1228800 (= 9600*512/4).

					der Mouse

			       mouse@rodents.montreal.qc.ca
		     7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B