Hello everyone, Before I get to the problem let me say that I have exhausted EVERY other source of information on this topic. I've read all the how-tos and asked numerous self-proclaimed Linux gurus to no avail. My problem is thus: I'm having a bit of a problem attempting to get an old 286 laptop to act as a dumb terminal through a null modem cable to a Win 3.x terminal. I narrowed the problem down to a faulty serial port on the Linux box side. I am running Mandrake 7.1 with a 2.2.15 kernel. I diagnosed my serial ports by using "setserial -g /dev/ttys*" I got the following output: /dev/ttys1: Input/output Error /dev/ttys2: Input/output Error .. .. etc. all the way down to /dev/ttysf: Input/output Error. Thinking this is extremely odd, I checked out my BIOS. I happen to know that the serial ports do in fact work (under windows). Also, my BIOS listed the ports as: Port 1: 3F8/IRQ4, Port 2: 2F8/IRQ3. Knowing this, I hit the net on a tireless search for serial port info. After reading several how-tos and looking at numerous posts, I decided to try the same procedure only using the "obselete" cua notation: $ setserial -g /dev/cua* /dev/cua0, UART: 16550A, Port: 0x03f8, IRQ: 4 /dev/cua1, UART: 16550A, Port: 0x02f8, IRQ: 3 /dev/cua2, UART: unknown, Port: 0x03e8, IRQ: 4 /dev/cua3, UART 16550A, Port 0x02e8, IRQ: 3 Eureka! Or something... It seems the antiquated cua devices register UARTs and match the serial port resources in my BIOS, but the ttys devices do not... After this I decided to test whether I could send output to the terminal or not: echo test > /dev/cua1 The console froze after the command, and did nothing until I hit ctrl-C. Next I tried the same command, only after starting up the terminal emulation program on the laptop. The command ran, and then I got the prompt. I glanced at the terminal. Nothing. It apparently worked, but where did this data go? Is there anything that could be readily causing this? Should I even be using cua devices for this? Help!? Thanks so much, Ken
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