In search of processor

I'll leave the spelling, punctuation and grammar corrections you need to address aside for now.

You say you need all nine pins of the RS232 connector. Do you really need the RI line? You'll find it difficult to find any equipment nowadays that supports it anyway. Modems, the reason it's there in the first place, don't output it anymore anyway. That, and everyone has since worked around it by looking at the incoming data for the Hayes style RING line.

If you're just using it for general I/O, I'm sure you can scrounge some spare pins on the CPU for that. 232 line levels are only good for longer distances, and there are better ways of doing that depending on your application.

What will you be plugging into it? If it's just for comms, you can probably get away without the DCD line, and even if you still need handshaking, you can use software handshaking and not have any dramas with firmware handling unless you're transferring binary.

That's four lines less. Makes your life much easier hardware wise.

Have you really thought through what you need?

This isn't a repair issue, find a proper place to post.

Michel

The kind of processor that has the horsepower to run a full operating system tends not to have much in the way of on-board peripherals.

You could use the classic 16550 UART. It'll teach you how such a port works for sure.

You'll find the equivalent integrated on many I/O chips.

Graham