At 09:46 PM 5/21/98 -0400, Joseph Martin wrote:
>Thanks for all the help. However I have a couple more questions. On the
>com ports and irqs. I can reset the irq without changing hardware jumpers
>for my DB25 port? (Are there even jumpers?) And yes I know how to do it
>with setserial I just want to make sure I'm not missing anything.
IRQ and Com ports has always been a problem with PC's..
Many of them are set via jumpers and if they are you will either have
to refer to the documentation that you got with the serial port card or
your computer (or perhaps the card / motherboard / case will have a
diagram).. If you have jumpers and no docs.. well.. good luck..
Newer computers can set their serial ports in the BIOS (thank god)..
Hopefully you will have one of these..
Anyway.. If I remember right.. You said you have:
Mouse - Com 1 - IRQ 4 *
Modem - Com 2 - IRQ 3
Terminal - Com 3 - IRQ 4 *
which I can almost guarantee you will not work.. This is because
the interrupts for the mouse and the terminal conflict.. You *may*
get the modem and terminal to share an IRQ.. but.. your most
likely way to get all 3 of them to work at the same time would be
to either switch to a PS/2 mouse (uses IRQ 12) or find out if you
can set one of your com ports to a non-standard IRQ.. (not 3 or 4)
>Secondly on wiring null modems... Could someone send real graphics showing
>how they are wired, or links to good instructions? (There's only so much
>you can show with ascii :) ). I am totally new to null modems and wirings
>and howto and such so pointers are welcome. (Info like which pins are
>which numbers, which direction it counts from, what numbers are on the
>top and bottom rows, etc.)
Check out the following pages that have pinouts..
http://confused.ume.maine.edu/mdw/HOWTO/Serial-HOWTO-8.html#ss8.1
http://www.geocities.com/TheTropics/Shores/2250/pinout.html
Hope this helps....
Robert Towster
