OK Steve.

I have one more problems.!
Now I lerned to setup this MAX3100, and I can see that
the interrupt-output from uart, as far as i send an RS232-word
into the MAX-Circuit (RxD).

But I have'nt figured out yet how to read the SPI bus.

I have tryed a several of routines in the interrupt-sequence, and
even put it into SBUF, to see at my terminal if there is something.
The only thing i can see, that the interrupt output (uart) drop down,
but never return to set, and thats means, that I never empty
the Fifo in spi-uart.
Miso/Mosi are quite ded on the logic-analyzer in read sequens.

What I do when I try to read the uart, is to dump SPDR into
ram, and after that, move ram into SBUF.

Actually, it's an GPS (trimble-card) connected into the max-uart, sending coordinates (a stream-9600bps) once per second, and when I finished with this application, i will transmitt this stream out to a Radio-
transceiver (450MHz).
Also on this motherboard, possibilities to act with an ordinary RS232,
or eight I/O-s to collect or set external info.

If you are curious aboute the MAX3100, see below, can be a nice
alternative if you need multiple uart's.

http://dbserv.maxim-ic.com/quick_vie...f_num=1731