230400 works for us - Mike used to run with a 230400bps serial card to minimise zmodem times :)

Bear in mind that standard PC serials do not run 230,400 - even though windows offers you the option. The standard 1.8432Mhz serial clock with a x1 divisor gives max 115,200bps: you need at least a 3.6864Mhz serial clock into your 16c[56789]50 to get 230400bps.

Hugo