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On Mon, 08 Dec 1997 08:15:19 -0800, Randal Whittle wrote: >At 08:46 AM 12/5/97, Paul Khoury wrote: >>>>3.1. How about connecting an external modem (regular PC modem) to the >>>> serial port? Any problems with this setup? >>> >>> Haven't done it, but the serial port supports 14550-type buffer chip, so I >>>don't foresee any problem in doing so. >> >>Actually, this doesn't sound like an existant chip. I think Randy meant a >16550, > > Yup. That's it. :-) > > It was quite an issue on the 750's, as their external serial port >supported only a 16450-type UART chip, and that just wasn't fast enough for >any decent, fast (then 14.4K) modem. > > I think that the 16450 adds buffering or some little feature to the 8250, and the 16550 has more improvements, and FIFO. Also interesting is that you can take off the 8250 or 16450 on older I/O cards and replace it with a 16550, because they operate exactly the same, but software determines whether you can use the advanced features of the 16550 or not. Paul