baud modifier

I have devices that will do this - these are actually RS-232 data switches that I designed in the 80s. It was a whole line ranging in size from 8 to 56 ports, once a connection is made, the ends operate with independant interfaces, and the switch mediates between them. For what you want to do you only need two ports. You will also need either some kind of flow control (RTS/CTS, XON/XOFF etc.) on the faster speed port, or a buffer large enough to contain the maximum possible data block that will be sent to the slower-speed port before the system waits for a response from it. Easy to design and build - a single-chip micro with two serial ports would fit the bill nicely, otherwise you could bit-bash the slow speed port, or use an external UART. Simply set the speed/parity/Dbits/Sbits that you want for each port, then copy data between them through buffers - when a buffer approaches full, assert flow control on the filling port, when the buffer later approaches empty, deassert flow control on the filling port. Dave -- dave06a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.classiccmp.org/dunfield/index.html