Wojciech, if you are interested I can send you an ISA, 16bit expansion
board made by Emulex. It has 1M ram and 80286 onboard. Two programable
RS232 or 485 or VT xxx ( 6 different interfaces mode ). Full
documentation. With this board you may add another two RS232 + four on
your computer = six. Enough I hope.
Vasile

On Wed, 14 Feb 2001, Wojciech Zabolotny wrote:

> On Wed, Feb 14, 2001 at 08:16:28AM -0300, Octavio P Nogueira wrote:
> > No, I need to emulate a serial port but I also need
> > to do some protocol change, so I need a PIC on it.
> >>
> In fact prices of good multiport RS-232 boards are so high (just check eg.
> Cyclades), that it could be nice to develop an Open Hardware version.
> I thought about it, however I wanted to connect the PORTD of 16F877 to the
> parallel port and use the "bit banging" technology to get 5 RS-232 ports
> (Tx, Rx, RTS, CTS).
> Certainly each of them should provide the FIFO queue (like 16550A does).
> The problem is however how to multiplex the data to/from 5 RS232 ports,
> using single 8-bit PORTD. Probably a special protocol using the "escape"
> characters would be necessary. Maybe someone could suggest any good
> solution...
>
>   Unfortunately this project is on the very last position on my list of
> hobbyist projects...
> --
>                                 Regards
>                                 Wojciech Zabolotny
>                                 wzab@ise.pw.edu.pl
>
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