> Hi all, 
> anyone knows what the max speed of a serial port on a MacIIcx? 

It depends on how much CPU time you want to dedicate to the serial port.
As LocalTalk demonstrates, you can get up to 240300 bits/sec. If you
take over the whole CPU.

> I use minicom recompiled for NetBSD and when connecting ot speed higher
> than 9600 I've lots of problem (FIFO messages, page losts...), but under
> MacOS and Zterm I've set the speed to 57600 and it works fine.
> What's the problem? Any suggestion?

I'm not sure what's wrong w/ MacOS. Are you doing a lot of LocalTalk or
Floppy access? Those would certainly tie up the CPU.

The fact it's working well under NetBSD just says we got the serial
driver working well. :-)

Take care,

Bill